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Too Ambitious?

C

Chrytek

n00b
Joined
Jun 20, 2014
Messages
10
I am currently awaiting the release of the Silverstone 600W SFX PSU. The specs of this PSU list the amps at 50 with a single 12v rail. Could this support a Radeon 295x2 with an undervolted cpu?

Assuming it can't how crazy would it be to mount a second PSU on the back of the Case?

Let me explain why I would even go through the trouble. Even with a back mounted PSU this is the smallest setup I could even imagine to run that card. Why do I want to run that card? I ordered an LG 34um95 and it looks like one 780ti or 290x wouldn't be enough to run games at high settings at 60fps. Please correct me if I am wrong on that.

Part of me wants to try and test it on one PSU but I am afraid I will be trashing the unit within the first month. What do you guys think? Should I just throw a 290x on water cool in there and call it a day? Maybe a 780ti? I'm struggling with this, 1500 is crazy for a video card but when I build a pc I use it 6 years before I upgrade. So the ROI would I believe be worth it. It also seems like the next Gen video cards will still be on 28nm with an improved architecture but it's highly unlikely there will be more than a 20% performance increase.

Any thoughts?
 
Ahh I should have specified. I would attempt this in the NCASE M1. However after a little more careful inspection it look like this would not be possible. I think the card is larger than the case will allow. With that I have decided that I will just watercool. Probably going to water cool a 290x because of the value, the money I save on the price difference between the 290x and 780ti will cover the the block/fittings cost. I will live with lower settings. Thanks!
 
I've been considering a major downgrade from my current rig to an ncase m1... be sure to get back with us and share your thoughts. Bummer that the 295x won't fit, that was my plan as well since I'm not sure how happy I would be with a single ti or 290x after running 3x780 HOFs.
 
The 295x2 will theoretically fit with a 140mm 750w PSU, but it would be hairbreadths of space. The problem comes that this only gives you 25-30w of overhead at peak load, and the independent reservoir precludes WC for the CPU. We were discussing this in the Ncase thread a few days back, as I had the same idea.
 
I wasn't aware of any 750W psu at 140mm existed. Yeah it looks like custom water cooling might work, however who wants to void the warranty on their 1500 card. If we can come up I am willing to try it out, although it wouldn't be until August when I get the case.

Honestly this cards power requirements are extremely limiting. The only feasible way to do this is to run an ATX power supply outside of the box. Honestly I don't think having an ATX outside of the case hidden under my desk is a terrible tradeoff. I would just integrate it under the top of my desk so you can only see a cord. Then just run it through the grommet in the back of the case. How dumb is this idea?

I would love to fully integrate it into the case but there would have to be a 140 750w to even attempt it.
 
TBH we're better off waiting for the 20nm cards next year, with hopefully lower power requirements on whatever equivalent to the 295x2 they cook up.
 
Honestly I agree, but that is 2 generations away. This new run is only 28nm. The problem is there won't be a single card that can run 4k resolutions on high for quite some time. At least with the 295x2 we can get that performance today with good cooling. Expensive but it should take 2 or 3 years before that performance is improved upon by a significant amount.

The problem with video cards is that occasionally you can buy the top of the line and then the next Gen blows it out of the water for cheaper. From what we know the next 2 gens will have improvements but I don't think any single cards will out preform the dual gpu 295x2. I don't know, like I said the trade offs don't seem worth it for the best performance. Of course this is only a concern for resolutions above 1080p.
 
I bailed on the M1 v2 for just this reason. I loved the power of the x2 and tried every angle possible to feel comfortable putting it into the M1 but it just can't happen, yet. Even if the 600 could handle it I imagine it would be loud as it's maxed out all the time.
 
I didn't abandon it, I grabbed one to have for when single GPU cards are even more powerful, like this fall with NVIDIA's Maxwell
 
I'm in a similar position to the OP, I'd like to use an 880, but it may not be out, and will almost certainly be slower than a 295x2. I've come to a much different conclusion than some of the others here regarding feasibility though. It should be quite doable to put a 295x2 into an M1. Every review I've found using a 295x2 drew in the 570-660W region at the wall, for a full system. A 140mm 700W PSU such as the one linked above should be able to power it without issue and with at least 10% overhead to spare, assuming the highest of the power numbers, and a 95% efficient supply, both of which are unlikely.

As for physical space, the 120mm rad that's part of the 259x2 could be mounted over the motherboard, and a heatsink that's sufficiently short could tuck between the CPU and the radiator, hopefully with enough space to have its own fan. Obviously I'd desolder/remove any PSU cables that aren't being used and shorten/reterminate those that are.

Thoughts?
 
WiSK said:
Silverstone has a 700W that is 140mm but anything more powerful goes to 150mm.

Edit: in fact all the Essential Series is 140mm
Click to expand...

I have this PSU in my SUGO SG08 with a 290x and it fits great. Tried two PSUs before it and this was the only one that fit.

As for fitting a 295x in a mini-itx, it can certainly be done. That said, I would caution against it. Running a 400w GPU in that small a space is not something I wouldn't want to do.

As for whether you want to run a 295x on a 600w PSU - definitely not.

My recommendation to OP would be to get the 600w STX once it's out, and match it with a 290x. You'll be suprised how well a single 290x can run at 4k which is what I'm doing. Then, when Maxwell or AMD's competitor is released, upgrade to one of those as they will surely give you more performance for less power.
 
harmattan said:
I have this PSU in my SUGO SG08 with a 290x and it fits great. Tried two PSUs before it and this was the only one that fit.
Click to expand...

Would you mind kind of describing how close the cables fit in the case with relation to the graphics card? I recently came across some parts (a 680 gtx and an mITX board) and I was going to using said parts and putting them into an SG08. I was going to hold out for the incoming 600W SFX, but if I need to wait for on the order of months instead of weeks, then I was thinking I'll should either buy one of the strider essentials or the 450 SFX.
 
Bobalias_LeShay said:
I'm in a similar position to the OP, I'd like to use an 880, but it may not be out, and will almost certainly be slower than a 295x2. I've come to a much different conclusion than some of the others here regarding feasibility though. It should be quite doable to put a 295x2 into an M1. Every review I've found using a 295x2 drew in the 570-660W region at the wall, for a full system. A 140mm 700W PSU such as the one linked above should be able to power it without issue and with at least 10% overhead to spare, assuming the highest of the power numbers, and a 95% efficient supply, both of which are unlikely.

As for physical space, the 120mm rad that's part of the 259x2 could be mounted over the motherboard, and a heatsink that's sufficiently short could tuck between the CPU and the radiator, hopefully with enough space to have its own fan. Obviously I'd desolder/remove any PSU cables that aren't being used and shorten/reterminate those that are.

Thoughts?
Click to expand...
Seasonic has a 750W non-modular 140mm long PSU, the S12G . It has almost all of its rating on the 12v rail as well (62a), so it's a good choice. I should mention, the power inlet does cause the angle plug in the M1 V1 to run afoul of the chassis, but we're changing to a left-angle connector for V2.

Assuming power isn't a concern then, the other issues are: 1.) room for routing the tubing from the card to the rad, and 2.) heat.

On the first, it looks like it could be made to work - maybe with longer dimensions of the rad running parallel to the length of the case. CLC tubing is often stiff and tricky to route in the M1, though.

Heat is probably the number one concern. As you say, you'd need to use a low-profile heatsink on the CPU, and if you've got the rad fan as intake, the CPU and motherboard are going to get blasted with hot air. It would almost certainly be better to have the fan as an exhaust, though I guarantee you won't won't to touch the side panel while it's under load.
 
Necere said:
I should mention, the power inlet does cause the angle plug in the M1 V1 to run afoul of the chassis, but we're changing to a left-angle connector for V2.
Click to expand...

Is that left-angle cord 28mm tall like the current right-angle cord and will it be available separately?

Edit: Nevermind, just saw your post in the other thread.
 
Necere said:
Seasonic has a 750W non-modular 140mm long PSU, the S12G . It has almost all of its rating on the 12v rail as well (62a), so it's a good choice. I should mention, the power inlet does cause the angle plug in the M1 V1 to run afoul of the chassis, but we're changing to a left-angle connector for V2.

Assuming power isn't a concern then, the other issues are: 1.) room for routing the tubing from the card to the rad, and 2.) heat.

On the first, it looks like it could be made to work - maybe with longer dimensions of the rad running parallel to the length of the case. CLC tubing is often stiff and tricky to route in the M1, though.

Heat is probably the number one concern. As you say, you'd need to use a low-profile heatsink on the CPU, and if you've got the rad fan as intake, the CPU and motherboard are going to get blasted with hot air. It would almost certainly be better to have the fan as an exhaust, though I guarantee you won't won't to touch the side panel while it's under load.
Click to expand...
Make no mistake, I'm aware shoehorning a 295x2 into an M1 is a stupid, stupid idea. But so are halfpipes and monster trucks. That doesn't make them less awesome ;)

There are several other possible, also insane, approaches. One would be to use a picoPSU for the mobo/CPU and the 600W SFX from Silverstone by itself for the GPU. Whether it will have sufficient 12V rail amperage is doubtful, though it would gain a fair amount of additional space inside the case for cooling.

The other possibility is to squeeze a 120mm radiator on the bottom of the case to cool the CPU. This would solve the problem of the (low profile and therefore crummy) CPU heatsink sucking in hot air from the 295's radiator. This is substantially more viable than the dual PSU idea.

So notionally a 140mm 750W PSU with custom modified cabling, the 295x2's radiator mounted over the motherboard blowing out, an H60 or similar on the bottom of the case at the front sucking in (likely with a slim fan), and additional fans tucked any place they'll fit to get as much air exchange as possible. This is such a wonderfully terrible idea.
 
Bobalias_LeShay said:
So notionally a 140mm 750W PSU with custom modified cabling, the 295x2's radiator mounted over the motherboard blowing out, an H60 or similar on the bottom of the case at the front sucking in (likely with a slim fan),
Click to expand...
Don't expect to be able to get two CLCs in the case - particularly with a big GPU and ATX PSU. There's just no room to run the tubing.

And of course, you won't be able to get a rad under the 295x2 anyway. Even if you take the shroud off, the CLC pumps are close to dual-slot by themselves. The only way to have a rad (slim, with slim fans) on the bottom is to make the GPU single-slot.
 
With a simple DIY adapter you could fit 2 SFX PSUs inside the case back-to-back so that they draw air from both sides of the case. Bigger problem is how'd you cool high end CPU when the 295x2 uses the only 120mm slot.
 
konda said:
With a simple DIY adapter you could fit 2 SFX PSUs inside the case back-to-back so that they draw air from both sides of the case. Bigger problem is how'd you cool high end CPU when the 295x2 uses the only 120mm slot.
Click to expand...

Maybe a 92mm Asetek AIO cooler on the back inside mount with the fan on the outside of the case?
 
TheUnluckyOne said:
Would you mind kind of describing how close the cables fit in the case with relation to the graphics card? I recently came across some parts (a 680 gtx and an mITX board) and I was going to using said parts and putting them into an SG08. I was going to hold out for the incoming 600W SFX, but if I need to wait for on the order of months instead of weeks, then I was thinking I'll should either buy one of the strider essentials or the 450 SFX.
Click to expand...

There's about 1 1/3" of space left from the end of my 290x where cabling for the PSU can run. The PSU cabling is directed upwards towards all the components, but you do need that horizontal gap as the space between the GPU and PSU is so close i.e. if my video card was 1 1/3" longer, there would be no room for the PSU cabling (which just made me realize a 295x would likely not work in this case, at least not without an SFX PSU -- and an SFX PSU doesn't exist that would power a 295x so no-go anyways). The cabling is not the tight point. The tight point is the back of the PSU comes about 5mm from touching the back of the 290x's PCB which was a worry when I was assembling, but it's seemed to work out fine.

Hope all that makes sense...

At the end of the day an SFX PSU is much better fit in the SG08, but a 140mm ATX PSU does work.
 
Last edited:
Necere said:
Don't expect to be able to get two CLCs in the case - particularly with a big GPU and ATX PSU. There's just no room to run the tubing.

And of course, you won't be able to get a rad under the 295x2 anyway. Even if you take the shroud off, the CLC pumps are close to dual-slot by themselves. The only way to have a rad (slim, with slim fans) on the bottom is to make the GPU single-slot.
Click to expand...
Aren't the pumps for the all in ones built into the block, not the rad? Corsair's website says the radiator is only 27mm tall, which seems quite workable. Throw a slim fan on top (or outside the case bottom, or both) and you're in business. The photos of the 295x2 seem to show its shroud/case being flush with the 2 slot bracket at the back, so it's not excessively tall either. Am I missing something? As for the tubing, if the 295x2 tubing has room to exit the side of the card (and it might well not), the CPU cooler's tubing should be able to fit through the same gap, no?
 
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