DAN C4-SFX: The smallest water cooling case in the world

If it ends up supporting dual 120's, I will be saying take my money, take it now. I really would love to have a tiny case that can accommodate a hybrid GPU, and a 120MM cooled CPU.
 
Hey dondan,
I like the new design language but I think the new case is too similar to the M1, not significantly smaller in footprint (which matters most) and has less to offer. So, I'm afraid it would have a hard time at Kickstarter.

I think you should consider a bolder approach and differentiate your new case significantly from what's available (that's how A4 became a success). Now open your mind and consider this layout:

Sketchfab link: 9L Dual AIO by theGryphon

Preview:
View attachment 37754
  • The model here includes two 120mm AIOs to cool both the CPU and the GPU.
  • Only the front and the top are (fully) perforated, all other sides (including the back) are solid.
  • The GPU is 300mm long.
    • As you can see, it's rotated 90 degrees wrt the motherboard, so a flexible riser as pictured above is required. As you know, Corsair One uses a similar 90 degree riser.
    • Also note that the hot side of the GPU is facing the outer panel, not the motherboard.
    • There is a net 72mm clearance between a regular 2-slot GPU and the motherboard surface.
    • There is also 13mm clearance between a 2-slot GPU and the PSU.
  • The fans on top are 92x25. They are the only fans in this configuration which requires them to blow out for negative air pressure.
    • The reason these fans are used instead of 120mm fans on the radiator is this: The GPU cables on top would already require this height for the case. Now that height is efficiently used for both GPU cables and the 92mm fans. This saves precious volume and footprint (which is the main design goal) for the case.
  • Alternative configurations:
    • A 240mm AIO cooler for the CPU with a 2.5-slot GPU with axial fans. 92mm fans are blowing out for negative air pressure.
    • A 120mm AIO cooler (at the top) for a 2-slot GPU along with a 120mm fan (blowing in) on the front and a CPU heatsink with up to 70mm height measured from the motherboard surface. 92mm fans also blowing in for a positive air pressure.
    • No AIOs, instead two 120mm fans in the front blowing in, and a CPU heatsink with up to 70mm height measured from the motherboard surface. A 3.5" drive may be used on top in place of the 92mm fans (while this would obviously lower the cooling potential for the case, some people may want to use the case with not-so high-end components).
    • In all configurations, a short GPU would enable using a 3.5" drive (or multiple 2.5" drives) in front of the PSU.
  • Case dimensions are 125 (width) x 210 (depth) x 360 (height) = 9.45 litres.


Additional benefits of this design:
  • No need for internal cables
  • ... except for an internal HDMI cable to enable VR devices from the front.
I doubt this would work well, tbh. Running the rads passively like that means it's wholly dependent on pressurizing the case to get air flowing through them, but you'll be losing a lot of airflow through the PSU.

I'm assuming this is partly inspired by the Corsair One, but keep in mind the Corsair One uses dual 240 rads, not 120. Those aren't fully passive either - they utilize the GPU blower and PSU fan to draw air through a section of the fins.

Aesthetically, I would suggest that both front top USB ports be USB 3.1.
A correction: you mean USB Type C, which is the physical connector. USB 3.1 is the electrical/signal interface standard, that will operate with any connector.

Also, to make it just a bit more confusing they retroactively changed the name of USB 3.0 to "USB 3.1 Gen 1," while the new standard is "USB 3.1 Gen 2." So now the old USB Type A blue ports are technically "USB 3.1." They're just the "Gen 1" version.

It's worth pointing out the new Type C ports are no guarantee of USB 3.1 Gen 2; they can be USB 3.1 Gen 1 (formerly 3.0), or even USB 2.0 (though I haven't seen that). AFAIK it's only possible to get a single Gen 2 port out of the new motherboard header, and since so far the few mini-ITX boards that have them only have a single header, the best you could manage is one Type C port on the case running Gen 2, and any additional Type C ports running Gen 1. Not exactly ideal.
 
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dondan I agree with you, and after some explanition and clarification the only thing that is worth considering changing is the fan hight compatibility (but you did that already) maybe +10mm for 25mm fans (the new noctua high static presure fans are verry promising). I don’t see any point for other modifications.

You can change the radiator and fan positioning with no problems by rotating the case and the front pannel.
The gap at the buttom is enought and will not restrict the airflow as long as the bottom fans are set to exahust.
The motherboard wil always be in the path of the airflow, always cooled, in fact it should have better airflow then most atx cases.
The PSU airflow would be a concern if the side pannels would not be perforated, but they are so won’t be hard for the psu to get more air, i won’t fight with the GPU for airflow as much as you think. And when you take in consideration the fact that most SFX psu’s are fanlees at idle, this airflow design should help really, the buttom fans sucking air in that means a portion of that air will come from the back side of the psu (when the fan is off). But if you really are so concerned about the psu temps you can flip the psu fan, such air from the top and assist the buttom fans.

Just my opinion here, the only way to know for sure is to test.. So i can’t wait for the prototype!
(I’m too lazy to test more configurations in the A4 :D)
 
I'm doubtful whether the slim fan / bottom radiator position will prove practical fro most buyers. I've had to extensively mod my M1 to get the bottom radiator position to work to a level that I'm comfortable with, and I'd like to think I'm already quite clear with my expectations ( Priority for aesthetics over performance in particular).
With a full thickness 25mm fan it may be borderline but most folk who water cool expect silly low temperatures even if it doesn't give them any practical benefit.

The top position however will be perfect. Even if you were to focus on a top position only with a cleaner design I'm sure you'd be on to a winner.

My "slim" radiator is still 30mm thick. I bought the Black Ice GTS 240. And I'm using 25mm fans in it. That being said, I'm one of the few who has a no-reservoir M1 and I'm getting some pretty fantastic temps from the radiator / fan combo cooling both the GPU and CPU. One radiator, 2 fans, that's it. No other case fans or anything. It's about as minimal of a loop as you can get.

And I'm +1 for the mindset of building this strictly around the "top radiator position" idea. I don't think a bottom radiator / fan setup makes much sense performance wise, and performance is what water-cooling is for imo.


Also just voted.
 
Voted....

From my own practical experience Noctua NF-A12x15 are GREAT.

I recently switched from the Silverstone FW121 which are already at the top of the list when it comes to noise/pressure.
The Noctua fans are very significantly quieter and have far less vibration. There is also less airflow spillage resulting from back-pressure when mounted against the radiator. I can't really comment on the temperatures because my control scheme changed, but I'm happy with the temperatures.


I still can't see the majority of buyers being happy with the compromises required for the slim fans however. Where you could run a decent full thickness fan around 900rpm with great results, you'd still need to cross into that audible threshold with a slim fan.

As for the case against the bottom radiator placement...

I've tried the following in the M1:
22 FPI bottom rad only
16 FPI bottom rad only
16 FPI bottom rad + 92mm rad
16 FPI bottom rad + 92mm + large cut outs
16 FPI bottom rad + 92mm rad + entire bottom cut out
16 FPI bottom rad + 92mm rad + entire bottom + taller case feet

It wasn't until I got to the double radiator + large cutout stage that I was happy with the temperatures and fan noise. With a full cut out and taller feet I'm at what most people who water cool would be happy with in the mid 50's.

Aesthetically a top radiator still allows a great side window display and far better temperatures.

dondan have you given any thought to the internal ventilation design in the C4-H20?
My wishlist from water cooling the M1:
- A prefabricated ducting solution
- Somewhere to mount a DDC pump
- Some mounts to positively draw fresh cold air into the case ( Maybe a good place for the slim fans with a filter in the bottom? - looks like there is room there)
- Better able management - I've yet to really see an SFF case with considered cable management in the same way that larger cases handle it.
- Greater breathing room for the radiator fans - I think you've covered this with the dual chamber design
- Compatibility for wider GPU's - I think you've already covered this
 
theGryphon:
Thank you for your idea, but I don't like your layout because of following reasons:
- I don't like skyscraper style cases
- Your design requires a riser cable with complicated bend so I have to use 3M and this will result in long production time + high price
- Your design requires special display port and HDMI extensions that will be not up to day some years ago and will increase the price
- Two 92mm fans have to spin fast and loud to generates enough pressure

I am very happy with my current design, so changing it is not an option. Optimizations are possible as long as they refer to my design.

Fair enough, except that there would be absolutely no need for any cables to provide. The user would use their own cables, pass through from the back and install. 92mm fans would not interfere with modern cables such as DP or HDMI.
DVI cables would be a no-go though...
Only an internal HDMI cable can be used to enable VR from the front IO...



I doubt this would work well, tbh. Running the rads passively like that means it's wholly dependent on pressurizing the case to get air flowing through them, but you'll be losing a lot of airflow through the PSU.

I'm assuming this is partly inspired by the Corsair One, but keep in mind the Corsair One uses dual 240 rads, not 120. Those aren't fully passive either - they utilize the GPU blower and PSU fan to draw air through a section of the fins.

I think you misunderstood the intended airflow. The top fans are and should be in the orientation to create negative airflow, which means they are working together with the PSU fan, not against it.

True that Corsair One inspired me and that it uses 240mm rads, not 120mm. However,

  • It has only one 140mm fan to actually exhaust the hot air from the case.
  • It is much more cramped so the airflow is much more restricted. Radiators are pretty much blocked by other components.
  • Its PSU fan is not contributing anything. Let alone that, it bugs the internal airflow and dumps hot air inside the case.
  • Radiator size becomes relevant (and increasingly significant) only with sufficient airflow. Plus, its radiators are of very slim type, so there is that too.

Summary: Corsair One has larger radiators but much worse airflow through those radiators, plus the PSU hot air is also left to be handled by that single fan.
STILL, it performs pretty well.

So, I believe the case design I proposed would work much better than you think....
 
I think you misunderstood the intended airflow. The top fans are and should be in the orientation to create negative airflow, which means they are working together with the PSU fan, not against it.
Sorry, my mistake. I read a bunch of posts and then came back to respond to yours without re-reading it, and I think I got it confused with another post in the process. So, negative pressure then.


True that Corsair One inspired me and that it uses 240mm rads, not 120mm. However,

  • It has only one 140mm fan to actually exhaust the hot air from the case.
  • It is much more cramped so the airflow is much more restricted. Radiators are pretty much blocked by other components.
  • Its PSU fan is not contributing anything. Let alone that, it bugs the internal airflow and dumps hot air inside the case.
Now that I go back and look at it, the PSU in the Corsair One pulls air from the backside of the GPU and motherboard, and ejects it directly into the path of the top exhaust fan, to be immediately blown out the top. So in effect, it's not really dumping any hot air in the case.

Radiator size becomes relevant (and increasingly significant) only with sufficient airflow. Plus, its radiators are of very slim type, so there is that too.
I would argue the opposite. When you don't have a lot of airflow, you want more surface area to compensate, not less.

Also, 2x 92mm fans do not necessarily produce more airflow than a single 140mm. Take these Noctua fans, for example:
Code:
Model             Size          RPM    dB/A     m³/h     mm H2O

NF-A14 PWM        140x140x25    1500   24,6     140,2    2,08

NF-A9 PWM         92x92x25      2000   22,8     78,9     2,28

Two 92mm fans move about the same amount of air as a single 140mm (different speeds, but similar noise levels - although pitch is likely more annoying on the smaller fans).
 
Sorry, my mistake. I read a bunch of posts and then came back to respond to yours without re-reading it, and I think I got it confused with another post in the process. So, negative pressure then.



Now that I go back and look at it, the PSU in the Corsair One pulls air from the backside of the GPU and motherboard, and ejects it directly into the path of the top exhaust fan, to be immediately blown out the top. So in effect, it's not really dumping any hot air in the case.

I would argue the opposite. When you don't have a lot of airflow, you want more surface area to compensate, not less.

Also, 2x 92mm fans do not necessarily produce more airflow than a single 140mm. Take these Noctua fans, for example:
Code:
Model             Size          RPM    dB/A     m³/h     mm H2O

NF-A14 PWM        140x140x25    1500   24,6     140,2    2,08

NF-A9 PWM         92x92x25      2000   22,8     78,9     2,28

Two 92mm fans move about the same amount of air as a single 140mm (different speeds, but similar noise levels - although pitch is likely more annoying on the smaller fans).

You are probably right about the surface area but the case layout I put up there has three 92mm fans (including the PSU) directly exhausting air, not two.

The worst case, the case depth can be increased by 10mm to accommodate slim 120mm fans in the front. This would bring the case dimensions to 125x220x360 = 9.9 litres... Say 10 litres.
 
dondan what is the clearance between the CPU and the graphics card? My concern is that any AIOs with the pipes exiting straight out of the water block will push hard against the back of the GPU or simply not fit. The Corsair H100i is an example of what I am taking about. I know is is difficult to fit it in a NCASE for the same reason.
 
Today I ordered a Arctic Accelo Hybrid-III *GPU AiO) to get the real length of Asetek based 120mm radiators. It is the same for EVGA and NZXT. If it is true the length is lower or equal 152mm I will add cutouts to the middle plate so the case will support 2x120mm radiators :)
 
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You have 60mm

I wonder is that enough, there are quite a few AIO designs where the tubes come straight out the top of the block. The old Corsair H100 v1 had swivels at the side which were great but probably they are more prone to leaking. Anyone have a H100i v2 or similar AIO to test the bend radius of the tubes and see if 60mm is enough?
 
Today I ordered a Arctic Accelo Hybrid-III *GPU AiO) to get the real length of Asetek based 120mm radiators. It is the same for EVGA and NZXT. If it is true the length is lower or equal 152mm I will add cutouts to the middle plate so the case will support 2x120mm radiators :)

If I can use 2 120mm AIO coolers with them mounted on the top then this will be an instant pledge/purchase for me! The A4 will go to the closet for use at a later date.
 
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theGryphon:
Thank you for your idea, but I don't like your layout because of following reasons:
- I don't like skyscraper style cases
- Your design requires a riser cable with complicated bend so I have to use 3M and this will result in long production time + high price
- Your design requires special display port and HDMI extensions that will be not up to day some years ago and will increase the price
- Two 92mm fans have to spin fast and loud to generates enough pressure

I am very happy with my current design, so changing it is not an option. Optimizations are possible as long as they refer to my design.


JackGLemmon:
I am not interested in optimization a already made design from Lian Li.


Quartz-1:
And as I mentioned just flip the case and it will be on top. The U-Frame side panel will protect it.
Changing the position of Audio and USB ports on top will make flipping the case impossible. It is not possible that the card "adrift" or sag down because it is clipped in the PCIe socket holder and screwed to the case. Also the riser is screwed to the chassis.
Changing to complete USB3.1 will be only supported by one premium priced ITX board. I don't want to limit the usage of I/O to a single mITX board.

That is not how USB works at all. The entire USB lineup (protocol, not the connector) is fully backwards compatible. This means that with the appropriate adapter (which are easily obtained online for <10$) one could even connect a USB 2.0 capable motherboard connector to the USB-C connector. The USB-C would just run at USB 2.0 speeds in that case without all the new features.
I personally think one USB-C and one USB 3 connector is perfect. It gives you full compatibility with everything USB.


If I can use 2 120mm AIO coolers with them mounted on the top then this will be an instant pledge/purchase for me! The A4 will go to the closet for use at a later date.

You could use the A4 as a NAS in that case. Would be a shame to not display it. I currently use my Sentry as a NAS.
 
I'm thinking riing fans atop 30mm rad, with the side panels clearanced around the fan "barrels", and the top fan flanges removed, would be a badass looking mod
Didcot_power_station_cooling_tower_zootalures.jpg
 
Hi, i didn't read every single comment in this thread, but here are some thoughts:

- This looks absolutely beautiful and a really like the concept;
- I think allowing compatibility with 30 mm + 25 mm fan is worth the trade off for a little more height. Overall component compatibility is already restrictive enough, all the most common 240 mm AIO should be supported with their included fans.
- Feet height will restrict airflow. Higher feet will surely improve performance.
- I would also love to have a dust filter included in the case.
- Isn't the GPU a bit too close to the side panel? I know the idea is to get close to get fresh air from the outside, but if it's too close it may generate extra noise and performance loss. Is it the same distance as in the A4?
- I assume you can use the fans with inverted orientation, operating with positive pressure... right?
 
I'm not really yech savy for all the current talks but I like the case design.
I'm not a fan of the aio but i like this flip design and abit bigger Dan case means I can have fans either at the top or at the bottom for added ventillations right?
 
Would you consider making a stealth version of this, with no front I/O, no on button (have it somewhere on the backside) and preferably no brand name? I feel like people buying these cases care for a minimalist device so having a minimalist look would go well with that.
 
Thank you for being part of my poll. Here is the result:


umfrage_darkdjp3k.jpg



The result is very clear! The most participants like to use a radiator with a thickness of 28-30mm in combination with a 120mm fan with a thickness of 25mm. Like I handled it with the A4-SFX project I want to give you the chance to have influence on the final product.Therefore I increased the height of the radiator/fan chamber to 55mm. To stay under 10l I made the hardware chamber 2mm smaller. So the total case dimensions are: 127,5 x 242 x 323,6mm (W x H x D) = 9,9l

The new cooling chamber allows the following radiator configurations:

· 22mm thick radiator + 25mm fan
· 27mm thick radiator + 25mm fan
· 30mm thick radiator + 25mm fan
· 38mm thick radiator + 16mm fan
· 40mm thick radiator + 15mm fan


I am wondering that only 7% of the participants plan to use air cooling. Maybe the name of the product suggest that you only can use water cooling or the poll image in the threads looks like a only water cooling related poll.

Furthermore I never thought that 48% plan to install a custom water cooling solution. Because at the current state it isn’t clear that a custom pump will fit.

I did a bit of research to identify all custom water cooling radiators that will fit:


26-30mm thickness class:

· Aqua Computer Airplex Pro 240
· Bitspower Leviathan Slim 240
· EK Water Blocks EK-CoolStream SE 240
· MagiCool 240 G2 Slim Radiator
· MagiCool 240D
· MagiCool Xflow Copper Radiator II


30-40mm thickness class:

· EK Water Blocks EK-CoolStream PE 240
· Swiftech MCR220 Quiet Power
· XSPC AX240
· XSPC EX240
· XSPC EX240 Crossflow V1/V2
· XSPC EX240 Multiport


Thank you for your help

Daniel
 
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Thank you for being part of my poll. Here is the result:


umfrage_darkdjp3k.jpg



The result is very clear! The most participants like to use a radiator with a thickness of 28-30mm in combination with a 120mm fan with a thickness of 25mm. Like I handled it with the A4-SFX project I want to give you the chance to have influence on the final product.Therefore I increased the height of the radiator/fan chamber to 55mm. To stay under 10l I made the hardware chamber 2mm smaller. So the total case dimensions are: 127,5 x 242 x 323,6mm (W x H x D) = 9,9l

The new cooling chamber allows the following radiator configurations:

· 22mm thick radiator + 25mm fan
· 27mm thick radiator + 25mm fan
· 30mm thick radiator + 25mm fan
· 38mm thick radiator + 16mm fan
· 40mm thick radiator + 15mm fan


I am wondering that only 7% of the participants plan to use air cooling. Maybe the name of the product suggest that you only can use water cooling or the poll image in the threads looks like a only water cooling related poll.

Furthermore I never thought that 48% plan to install a custom water cooling solution. Because at the current state it isn’t clear that a custom pump will fit.

I did a bit of research to identify all custom water cooling radiators that will fit:


26-30mm thickness class:

· Aqua Computer Airplex Pro 240
· Bitspower Leviathan Slim 240
· EK Water Blocks EK-CoolStream SE 240
· MagiCool 240 G2 Slim Radiator
· MagiCool 240D
· MagiCool Xflow Copper Radiator II


30-40mm thickness class:

· EK Water Blocks EK-CoolStream PE 240
· Swiftech MCR220 Quiet Power
· XSPC AX240
· XSPC EX240
· XSPC EX240 Crossflow V1/V2
· XSPC EX240 Multiport


Thank you for your help

Daniel

Well as far as the few people who selected air cooling, I would think that the majority of people who aren't water cooling would go with your A4 case - no need for the larger size to allow for non-existent water cooling parts right?

Custom vs AIO - a DDC pump really doesn't take up a ton of space. I actually ended up with plenty of empty space under my GPU in my NCase M1 build, thanks to using an integrated pump / CPU block and no reservoir (and I really can't get over how cold it runs, sorry guys I know I keep throwing it out there but hitting 50 degrees under full load for hours of gaming is just awesome - and it idles in the high 30s to low 40s). So, I would think that as long as there is room for a Swiftech Apogee Drive II or similar on the CPU, or room for a radiator w/ integrated pump / GPU block w/ integrated pump, there will be some very creative, tightly packed custom loops with your case and I can't wait to see what people do with it.

I would also like to say I think it's awesome that you're developing this with community feedback as interactively as you have been. It always boggles my mind when a new case comes out from a major brand that has people scratching their heads like "who in the heck thought this would be a good idea?"

Oh and FWIW I'm using a 30mm radiator with 25mm fans, but as I said it runs very cold and nice and quiet.
 
Furthermore I never thought that 48% plan to install a custom water cooling solution. Because at the current state it isn’t clear that a custom pump will fit.

I did a bit of research to identify all custom water cooling radiators that will fit:


26-30mm thickness class:

· Aqua Computer Airplex Pro 240
· Bitspower Leviathan Slim 240
· EK Water Blocks EK-CoolStream SE 240
· MagiCool 240 G2 Slim Radiator
· MagiCool 240D
· MagiCool Xflow Copper Radiator II


30-40mm thickness class:

· EK Water Blocks EK-CoolStream PE 240
· Swiftech MCR220 Quiet Power
· XSPC AX240
· XSPC EX240
· XSPC EX240 Crossflow V1/V2
· XSPC EX240 Multiport


Thank you for your help

Daniel

Custom vs AIO - a DDC pump really doesn't take up a ton of space. I actually ended up with plenty of empty space under my GPU in my NCase M1 build, thanks to using an integrated pump / CPU block and no reservoir (and I really can't get over how cold it runs, sorry guys I know I keep throwing it out there but hitting 50 degrees under full load for hours of gaming is just awesome - and it idles in the high 30s to low 40s). So, I would think that as long as there is room for a Swiftech Apogee Drive II or similar on the CPU, or room for a radiator w/ integrated pump / GPU block w/ integrated pump, there will be some very creative, tightly packed custom loops with your case and I can't wait to see what people do with it.
The Apogee Drive II with fittings is >70mm tall, so that's not an option. Rads with integrated pumps are also way too big. A standalone DDC or other small pump might fit under the PSU, but it'll be tight. Two options that look like they might work:
Of these, the Eiswolf seems like the best bet. The Celsius' rad might be a little thick or long, and probably isn't an ideal candidate.

Regardless of which of these pump options are used, it seems a stretch to imagine there would be room for a res.
 
The Apogee Drive II with fittings is >70mm tall, so that's not an option. Rads with integrated pumps are also way too big. A standalone DDC or other small pump might fit under the PSU, but it'll be tight. Two options that look like they might work:
Of these, the Eiswolf seems like the best bet. The Celsius' rad might be a little thick or long, and probably isn't an ideal candidate.

Regardless of which of these pump options are used, it seems a stretch to imagine there would be room for a res.
Even with 90° swivel fittings? Also when I looked a while ago the apogee was impossible to buy have they started making it again?
 
Ah yeah crap. Too tall. Hmmmmm well I mean worst case you mount the pump outside the case but I do like the look of that Eiswolf...I suppose mounting point for a DDC pump is one more thing to consider in the design since there's a significant number of people planning on doing a custom loop in this case.

edit - Dan lists the max CPU cooler height as 60mm. Even without the fittings, per the following link the Swiftech Apogee Drive II is 61.5mm tall.

http://www.swiftech.com/apogeedrive2.aspx#tab3

:(
 
Today I meassured the Arctic Hybrid III that use a 120mm standard Asetek radiator. It looks like two 120mm radiatirs will be 300mm in length. So you will be able to use one 120mm AiO for CPU and the second one for GPU :)
 
Today I meassured the Arctic Hybrid III that use a 120mm standard Asetek radiator. It looks like two 120mm radiatirs will be 300mm in length. So you will be able to use one 120mm AiO for CPU and the second one for GPU :)

This is marvellous news. So the case will also get a cutout for the tubing of the second AIO to enter the chassis?
 
Hey dan, big fan of the case and all your work. Ordered an A4 V2 myself. When do you think this case will be released/put on kickstarter? Apologies if you’ve already said, I didn’t get a chance to read everything
 
Will the graphics card be secure hanging from the PCIe bracket and slot lock? I have a feeling the vast majority of people will use the case with the radiator on top to get better graphics cards stability, upright orientation for better looks, and better airflow.
 
I think k a DCC
Ah yeah crap. Too tall. Hmmmmm well I mean worst case you mount the pump outside the case but I do like the look of that Eiswolf...I suppose mounting point for a DDC pump is one more thing to consider in the design since there's a significant number of people planning on doing a custom loop in this case.

edit - Dan lists the max CPU cooler height as 60mm. Even without the fittings, per the following link the Swiftech Apogee Drive II is 61.5mm tall.

http://www.swiftech.com/apogeedrive2.aspx#tab3

:(
Those fins are not necessary, they aren't on a standard DCC pump. Easily they could be reduced in height. The problem would likely be routing the tubing without hitting anything.
 
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