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post #11 of 14
Quote:
Originally Posted by Noupoi View Post

The actual TDP of the system is 675 W (145W for the CPU, and 2x 265W for the GPUs), which makes it a little easier to cool. If I run the fans at 1400 rpm, and had a quad ST30 (to make the calculation simpler), I'd have 25.4 °C delta-T. Would this be more acceptable, and better than standard air cooling?

Hi Noupoi,

Unless you are folding or bitcoin mining or something, there's no way your components will generate 675W of heat. You won't even reach that level of heat production unless they are heavily overclocked and constantly stressed 100%. It would certainly be a high overclock on the CPU to produce 145W. My i7-3770K @ 4.5GHz only generates about 60W heat for example. Moreover, waterblocks are not perfect at transferring this heat into the loop, so it's not like your radiators will need to dissipate all of these watts anyway.

Also I'm not sure about your extrapolation calculations of Martin's data for the ST30. I can't give you the right way to calculate this, but 25C ambient-water delta with 4 x 120 seems very high. In comparison, I have cooled about 200W with a single 120 rad with push-pull fans around 1400rpm. The ambient-water delta was around 15C which kept CPU core temps under 70C and GPU temp under 50C. Presumably with 480 worth of rad, at that speed of fans I could have dissipated 800W. Recently I changed to a 240 rad. I could aim for ambient-water delta of 10C with the fans varying between 800 and 1200 rpm. I used an Aquaero to control fans based on water temp instead of CPU core temp. So I that's why I think in your situation you can probably get great temps with much lower fan speeds.
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post #12 of 14
Thread Starter 
Yeah, the 25C delta does seem unusually high, when there are people with similar setups that run great.

While the 675W is a worst case load, wouldn't you be able to get a good way there after say a few hours of gaming, (assuming SLI scaling worked properly) with an average of near 100% load on the GPUs, and say 30% load on the CPU? I suppose the overclock that I'm allowing for, assuming I get a good chip, is quite aggressive on reflection (4.8 GHz @ 1.4V).

I'm surprised with how effective a single rad (that AX120 in your sig rig?) was able to cool that system - much better than you would expect from Martin's numbers. Taking a closer look at Martin's test setup, it does seem far more restrictive than a typical PC case, so you'd think that in the real world, radiators will perform much better.

It does reassure me that 480mm of rad should be enough for my setup. Controlling fan speed based on coolant temperature seems like a great, but expensive idea. I might have to look in to that some more!
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post #13 of 14
I would drop the 120mm to 140mm adapters, and get some BGears Blasters, with a speed controller.

True, there are a lot less quality 140mm fans compared to 120mm fans, but there are still some, and you only need two ;P


BGears Blasters are really nice fans, and are cheap in price to boot.
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post #14 of 14
Thread Starter 
Yep, I don't think I'm able to use the adapters due to clearance issues.

BGears Blasters don't seem to be available in the UK, so there not really an option. I'm thinking of getting Aerocool Sharks, or Noiseblocker PK-3s. I'm not sure why some members of OCN are discouraging people from using the Sharks, as if go back to Martin's testing (again!), they do quite well.

The build I'm planning will be black and green themed, so the choice of fans is also fewer.
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