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What Size Power Supply Would I Need? - Page 2

post #11 of 13
Thread Starter 
So what should I do in this situation? Is it because the peltier pad is too big? Would it be better to get two smaller ones? If I wanted to overclock the CPU how much more cooling would I need? I have three fans that move 147cfm each and four more than move 103.5cfm. Just an FYI
post #12 of 13
The major issue is the radiators you want to use.

It's because those TECs are so inefficient. You need a more efficient one but they cost quite a bit more. The one I'm talking about is:

Custom Thermoelectric - 400W Qmax TEC 62mm

The values for these TECs are different from the eBay ones. It will generate 168W each instead of the 282W that the eBay TEC will. That's about 40% less heat. This would put your hotside temps at about 41.89°C with 2K fans. Your delta will change also though. In this case, your delta is about 25°C. Cold temps should be 16.89°C which is actually less gain in the end. Those fans will definitely help, but I can't really give you any numbers for those as there's no actual reference for me to use. I suggest using same CFM on the same radiator in push/pull. This will give you ~1.5x the benefit of a single in push. So it will be like having a triple radiator in push.

Long story short, if you use the efficient TECs, total power draw from 2 TECs would be 336W, which might be able to be supplied from your ATX PSU or a lower powered (cheaper) PSU from eBay.

In the end, the performance is going to come out about the same when you use those fans, either way you go. I wouldn't suggest adding another device to the loop, or overclocking unless you use better radiators and the efficient TECs.

EDIT:

I ran the numbers after the post so here's what I got! This is if you're using 2k fans.
Note: These values are as accurate as I could get, and these values should be more trusted than my last values achieved in terms of accuracy. There would be differences in cold and hot temperatures as thermal resistance of the TEC Assembly (Hot and Cold plates) and will reduce some of the gains achievable when implemented.

eBay TEC

CPU + 2xGPU = 377W
TECs @ 12V = 571W
Total = 948W
Rads = 0.03°C/W
Delta = 14°C
Ambient = 25°C
Hotside = 53.4°C
Coldside = 39.4°C
This is worse than the 36°C you would get with just using those two rads as watercooling the devices.

CPU + GPU = 227W
TECs @ 12V = 554W
Total = 781W
Rads = 0.03°C/W
Delta = 32°C
Ambient = 25°C
Hotside = 48.4°C
Coldside = 16.4°C

CTE TEC

CPU + 2xGPU = 377W
TECs @ 12V = 312W
Total = 649W
Rads = 0.03°C/W
Delta = 15°C
Ambient = 25°C
Hotside = 44.5°C
Coldside = 29.5°C

CPU + GPU = 227W
TECs @ 12V = 299W
Total = 526W
Rads = 0.03°C/W
Delta = 27°C
Ambient = 25°C
Hotside = 40.8°C
Coldside = 13.8°C

It looks like the CTE TECs are the better bet. They will cost more but you will save money on a power supply, it will pump less heat into your room and will cost less to run for your power bill. They retail from CTEs website at $56.50 each.

*These are rough educated guesses as TECs behave differently than what any chart will say.
Edited by Krow - 2/5/13 at 9:37pm
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Whitey!
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Crosshair IV Formula HIS Radeon HD 5870 2GB 4x2GB Corsair Dominator DDR3-1600 
Hard DriveOSMonitorKeyboard
Corsair 32GB SSD, Seagate 1TB, Western Digital 1TB Windows 7 Ultimate SyncMaster 245B and SyncMaster 2343 Logitech G15 v2 
PowerCaseMouseMouse Pad
Antec 850W True Power, Meanwell 600W 24V Painted CoolerMaster Half 932 Logitech G5 Weighted Mouse Steelseries Frosted Glass 
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post #13 of 13
Thread Starter 
I don't think we're on the same page but maybe I'm wrong. Let me explain my system. Right now I have my CPU and GPU in a loop being cooled with 2 360 radiators with 147CFM fans. I want to cool that loop down more with the TEC chiller and have another loop just to cool the hot side of the peltier. The 2 single radiators would be for cooling the hot side of the peltier only
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