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HD 7990 watercooling, how much heat generated?

post #1 of 3
Thread Starter 
Long story short, I found a guy on Craigslist looking for help to build a watercooling setup. Little did I know that he has TONS of equipment and is into litecoin mining. The rig he has me helping him with (only the relevant parts are mentioned because this is all we are cooling) is a Corsair Obsidian 900D case with 4 HD 7990's. No joke he has 30 more of these cards on the way to make more rigs, I've seen the order with my own eyes.

He already got all the water cooling equipment from frozencpu which is great. I just come in build it and leave. I just need some advice from people that have cooled MULTIPLE HD 7990's. I know these are dual GPU cards and my concern is heat generation. He got a HUGE MO-RA 360 Radiator., and each build has 5 pumps. Now here is my question... Does this build REALLY need 5 pumps and is that radiator overkill? He told me that the guys from frozen cpu where very clear about this needing 5 pump. I was there last night thinking I could finish it in a day and boy was I wrong. Installing 5 pumps is no joke. Two are EK D5 X-RES Top 100 w/ D5 Vario Pump, One XSPC Twin D5 Dual 5.25" Bay Clear Reservoir w/ Twin XSPC D5 Variable Pumps Installed, and One Alphacool VPP655 Variable Speed Pump - HF Top Edition. The only reason I see a need for this is for flow rate concerns, but seriously 5 pumps?

So in conclusion, Is 5 pumps overkill? and Whats a ood radiator size that would be sufficient for 4 HD 7990's?
HAF 912
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HAF 912
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post #2 of 3
5 pumps would seem overkill in terms of flow.

But if he isn't near the PC at all time, the extra pumps may be for backup, if one or two may fail (and then three pumps is still overkill for the flow).

If he checks on the PC's regularly, I would say two pumps is enough at speed 4 or 5.

About the radiator;
Well that depends also on the fans he will be using.
I would say that the one 9x120mm radiator might just be enough with some high RPM/CFM fans (like 2000 rpm).
It would in the long term still get hot for the GPU's but I doubt it will be more than water air cooling would do.
(just remember to have some pressure release since it is a bit different in temperature for that loop).

If he intends to OC the GPU's I would say that he would need one more of those radiators and still 2000 rpm fans.
And it seems that money isn't an problem, so I would just take the extra radiator anyway.

(And why doesn't he just go air cooling?, If the machines isn't near him (noise))

I don't know where he is going to have he's machines, but with that many, why not make some huge water loop, with a big radiator outside (passive or not). Maybe trough the radiator in a nearby lake if possible biggrin.gif
post #3 of 3
Thread Starter 
He owns some data centers around here and will put the setups in his data centers. He runs some current rigs on air cooling using the R290's and HD 7990's (around 6 per MB) but says they generate so much heat he has to put them directly under one of his air conditioner outlets to keep them cool enough. Water cooling will solve that problem for him and in the long term might be more reliable.
HAF 912
(16 items)
 
  
CPUMotherboardGraphicsGraphics
AMD Phenom II X4 970 ASUS ROG Crosshair V Formula ATI Radeon HD 4870 X2 ATI Radeon HD 4870 X2 
RAMHard DriveOptical DriveCooling
G.Skill Ripjawz WesterDigital Caviar LG Super Multi Custom Water Cooling 
OSMonitorKeyboardPower
Windows 7 Home Premium Acer 20' Logitech MX 3200 Thermaltake Black Widow 850W 
CaseMouseMouse PadAudio
Coolermaster HAF 912 Razer Naga Steel Series Rift Edition Cyber Acoustics 2.1 
  hide details  
Reply
HAF 912
(16 items)
 
  
CPUMotherboardGraphicsGraphics
AMD Phenom II X4 970 ASUS ROG Crosshair V Formula ATI Radeon HD 4870 X2 ATI Radeon HD 4870 X2 
RAMHard DriveOptical DriveCooling
G.Skill Ripjawz WesterDigital Caviar LG Super Multi Custom Water Cooling 
OSMonitorKeyboardPower
Windows 7 Home Premium Acer 20' Logitech MX 3200 Thermaltake Black Widow 850W 
CaseMouseMouse PadAudio
Coolermaster HAF 912 Razer Naga Steel Series Rift Edition Cyber Acoustics 2.1 
  hide details  
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