Requirements for OC i7 + GTX295?

M

Mr. Baz

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Aug 17, 2001
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The last time I did any extreme cooling was way back in the day (2001) with the first 1GHz Athlon chips. I had to actually mill my own block since there weren't any companies selling watercooling stuff.

So what kind of radiator will I be needing to dissipate all that heat? Will a Black Ice XtremeII Radiator be adequate?
 
You shouldn't have a problem with that 2x120mm radiator, because I've had that one before and used it to cool my 280gtx+corei7(single-loop) without any problems. If you are looking for higher overclocks around 3.8ghz and above, you should think about investing into a 3x120mm or even double loops(with two radiators). From my experiences, core i7 runs HOT and for that water to be flushed into the GTX295, your room will get really hot. LOL
 
I was debating going with the XtremeIII. The nice thing is those black ice xtreme heater cores are dual pass instead of a lot of your wannabe single pass heatercores being sold for more. So they will be able to dissipate much more heat than a single pass.

I'm hoping for a max of 3.8GHz, but would be plenty happy at say 3.6GHz.

What kind of setup did you go with?
I'm a fairly big DD fan since they were one of the first pioneering companies that came out with watercooling stuff back in the day.
 
Just for giggles, I found a picture of the old waterblock I made.

WB1.jpg

WB4.jpg


Here is a picture of a CNC milled block I had made for a phase change setup I put together. -45*F on an unloaded evap block.
block.jpg
 
Depending on your CPU stepping, you should be able to reach 4.0GHz. In this case both the D0 and C0 can reach 4.0GHz pretty easily with liquid cooling. I'm not too sure about the other steppings available for the 920corei7. I have always been a Dangerden Fan aswell. Im currently using both a DD BlackIce II and a DD BlackIce GT for my setup. 2x120mm + 1x120mm and am running @ 4.0ghz stable.

PS: Those handmade waterblocks look SICK!(Both ways) Sick that you were able to make it!
 
Jenga said:
Depending on your CPU stepping, you should be able to reach 4.0GHz. In this case both the D0 and C0 can reach 4.0GHz pretty easily with liquid cooling. I'm not too sure about the other steppings available for the 920corei7. I have always been a Dangerden Fan aswell. Im currently using both a DD BlackIce II and a DD BlackIce GT for my setup. 2x120mm + 1x120mm and am running @ 4.0ghz stable.

PS: Those handmade waterblocks look SICK!(Both ways) Sick that you were able to make it!
Click to expand...

Yeah, all I had was a drill press and a dremel. I did the best I could at the time. I obviously have much improved skills since then (and tools). It worked well at cooling that Athlon and also did very well at cooling down a 150W peltier system.

So it looks like I could go with a 120.3 rad to cool an i7 and a GTX295 without worry then?
 
I still think running multiple radiators is a better idea, but then again I have friends with core i7 @ 4.0GHZ with a single 3x120mm radiator hooked with their 295gtx.
Make sure to properly mount the GPU block and CPU block with the top of the line Thermal paste and you should be good to go. I'm also assuming you have the A/C on. LOL. You should also use Hose clamps and run a leak test before installing, because your hardware is really expensive! good luck and let us know how it went.
 
I think a quad rad would really handle his heatload better, but it all depends on space restraints.
 
^^I'm in the same boat as you. Looks like a MCR320 should be able to handle the heat load and if not then stack on another one later.
 
You can use pretty much any rad, the bigger the rad the lower your temps will be though. Also depends what kind of fans you will be using if you prefer lower speed quiter fans rads with a lower FPI will work better or if you want to use high speed fans then rads with higher FPI tend to work better.
 
I'd say a feser 360 or thermochill pa120.3 if can find one they work great but they become a pain in the ass to find these days. I currently am running a dual loop system w/ 2 Thermochill pa120.3.The dual 295's oc'd to 695mhz are running about 52 underload on one loop and the other with i7 950 at 4.4ghz is capping at about 65c, that isrunning prime 95 9 hrs on small at medium even lower. I'm also running 1500lph pumps. Fans are the highest speed Scythe Typhoons which are pretty quite but also have a pretty good Sone rating too. It isn't an annoying sound with them.

A single 360 should handle the two of them easly if you aren't going for crazy oc. The thermochill is a low fpi I'm not sure about the Feser, but I have heard a lot of good things about them

Also are you looking at putting wb on the mosfets? On a high oc they put out crazy heat almost 100c

Cheers
Croaker
 
I'm in nearly the exact same position of the OP, and this info is great!

Croaker, in my current rig - mosfet temps are what are holding me back, do you use a WB for yours? What would you recommend? Could I get by with passive cooling?

If it carries any bearing, I'm looking at the P6T SE for a MB so I can use my LGA775 waterblock on it.
 
I have the BitsPower for the EVGA mobo. That or the EK block should be good. Both make blocks for asus boards.
 
Blazemore said:
^^I'm in the same boat as you. Looks like a MCR320 should be able to handle the heat load and if not then stack on another one later.
Click to expand...

If you stack, make sure you have plenty of static pressure from your fans, or you could easily lose total performance despite the second radiator. There was a thread on XS about this.
 
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