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post #11 of 15
You need MANY more than just 2 400Qmax TECs, unless you want 0dt at maximum load and pull a crap ton electricity.

First you need to pick your delta (and don't say -20) goal. A 20dt is respectable with TECs. Second you need to figure out what voltage you want to run the TEC at. More voltage is less efficient; aim for 50% of Umax which is about 12V, which is easy to come by as well.

Now if we use those 400W Qmax TECs, you need to move 800W (at max load) and maintain 20°C, any less and it's almost not worth it

Using the CTE charts for that TEC (here for full image),



Judging by the chart, to maintain 20°C you need each TEC to move 155W. You need 5.16TECs, and since you can't have less than 1 TEC, you need 6. This means each TEC is !133W of heat generated by itself. You need to vent 133W per TEC (798W) + the 800W of the GFX Cards and CPU.

If a triple radiator is good for 300W each, you need 5.3 triple radiators to vent that heat effectively.
Edited by Krow - 11/30/13 at 2:16pm
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post #12 of 15
Quote:
Originally Posted by Krow View Post

You need MANY more than just 2 400Qmax TECs, unless you want 0dt at maximum load and pull a crap ton electricity.

First you need to pick your delta (and don't say -20) goal. A 20dt is respectable with TECs. Second you need to figure out what voltage you want to run the TEC at. More voltage is less efficient; aim for 50% of Umax which is about 12V, which is easy to come by as well.

Now if we use those 400W Qmax TECs, you need to move 800W (at max load) and maintain 20°C, any less and it's almost not worth it

Using the CTE charts for that TEC (here for full image),



Judging by the chart, to maintain 20°C you need each TEC to move 155W. You need 5.16TECs, and since you can't have less than 1 TEC, you need 6. This means each TEC is !133W of heat generated by itself. You need to vent 133W per TEC (798W) + the 800W of the GFX Cards and CPU.

If a triple radiator is good for 300W each, you need 5.3 triple radiators to vent that heat effectively.

Well, unless you want your TEC hot loop to run warm each triple radiator is good for 220watts, roughly. With fans at 12000RPM-1500RPMs you'll move about 220 watts at 10c water/air dTemp. I'd assume you want to keep the hot loop within 10celcius dT as pullling roughly 300watts from a 62mmx62mm area is going to be pretty tricky.

Of course this all depends on what kind of deltas he's aiming for. Unfortunately TECs aren't cheap. XD

My advice to the OP is only put your CPU on the chiller loop. If you REALLY want to put your GPUs in a below ambient setup I'd recommend using direct die with them, and putting them in a traditional loop. Chillers really aren't good for super high load setups.
Edited by ZytheEKS - 11/30/13 at 8:09pm
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post #13 of 15
Ya, I just wanted to give him a rough idea what it would actually take to run full system cooling.
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post #14 of 15
TEC cool the CPU, the GPUs are easy to cool with just water.

My OC'd + overvolted 7970s don't break 51c mining (and are well under that gaming), and they are both on the same loop sharing just one Aquacomputer double rad. The water gets real hot (37-38c!) too, so with more rad they will be even cooler. I will be replacing it with an overkill GTX480 which should drop it to mid 40s load.
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post #15 of 15
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