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Using an 80W Peltier

post #1 of 20
Thread Starter 
http://jab-tech.com/Thermoelectric-m...m-pr-2738.html

^ That's an 80W Peltier on jab-tech.com for 11 bucks.


Question 1: Is it worth it? I know I'm not going to go near sub-ambient, and I don't want to. I want to know if it will give me better temps. I currently put out ~160 watts of heat.

Question 2: I'll have to get a new waterblock, the Storm isn't designed for TEC cooling. I'll be getting the Apogee, it's got better surface area for cooling. It'll be able to handle that much heat, right?

http://jab-tech.com/Swiftech-Apogee-...k-pr-3175.html
With the cryo-lab coupon code, I'll get it for 39.99. Not too bad, a $50 cooling experiment.

Question 3: Can my PSU handle this additional amp draw at the moment? I don't want to use another PSU because of the additional electric bill associated with it; I don't want to spend another 150 on a Meanwell, either.

Pinhead, please save me!
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post #2 of 20
I'd say go for it but I'm not sure about your PSU handling it...
Not bad at all...
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Not bad at all...
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post #3 of 20
Thread Starter 
Yeah...I would...I'm awaiting validation from Pinhead.

RE PSU amp draw, it's an 80W, so I don't think it'll draw that much in terms of Amps...Not sure though.
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post #4 of 20
If you're trying to cool your CPU... It'll raise your temps, probably enough to fry the chip. The pelt can only move 80 watts. The other 80 watts will be stuck on the CPU. That's not good. To even begin to cool a component, the pelt needs to be able to move all of the heat. Realistically, the pelt needs to move twice the amount of heat produced, since the pelt makes its own heat.

Also, peltiers run most efficiently at 50% of their rated voltage. If your CPU is putting out 160 watts and you'd get a 170w peltier, it'll still barely be able to cool it below ambient. I've seen 226w peltiers running full tilt barely cool a stock CPU. If you want to stay barely below or at ambient temp, your best bet would be to get a big peltier (437w or bigger @ 24v) and run it on 9 or so volts. Doing that, you'll need a bigger block (possibly the Apogee you're looking at) and a pretty thick cold plate. Even if you do keep it at a low voltage, you'll still need to condense-proof the board. At full load you may get right at "ambient" temp, but as soon as your CPU goes back to idle, it'll drop to way below ambient, probably by 15 or so degrees.

Edit: I'm sure you've probably already done so, but look at Nol's TEC guide (sticky) and it'll explain it better.
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post #5 of 20
Thread Starter 
Thanks I'll take that into consideration.
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post #6 of 20
as pinhead has mentioned you will probably get worse temperatures, my experience was with a 226 watt tec with all sorts of different combinations powering it and with my heavily overclocked cpu (3000+)at 1.75+ vcore @ around 3000mhz loaded it was not doing the job at all and the temps were just not worth it. The cooling was sufficient easily. I needed a more powerfull pelt clearly which in turn cost more to run and if you are worried about the power bill then you pretty well have to forget the TEC idea. sorry. This is just what I have found and I am no guru at all with a pelt, I still have the gear to get it running again but have moved on to the almighty compressors for now.........somebody help me
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post #7 of 20
Thread Starter 
Yeah, I was about to forget it because of the electric bill, but then I thought, why not use my existing PSU in my rig? It has 33 Amps on the 1
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post #8 of 20
Thread Starter 
I was about to forget the TEC when I considered how much current it would draw, but my Powerstream has 33 amps on the 12 rail, the 226W pelt draws 24 amps...Not looking good. It looks like this project is about to die.
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post #9 of 20
Quote:
Originally Posted by Burn
I was about to forget the TEC when I considered how much current it would draw, but my Powerstream has 33 amps on the 12 rail, the 226W pelt draws 24 amps...Not looking good. It looks like this project is about to die.
Most 226w peltiers run on 24 volts. You don't have a 24v supply... However, that'd be right at the "half voltage" that the pelt would run most efficiently. I doubt it'd cool the processor well, though, at that power level. I've only used the 437w peltier. It's also rated at 24v and I'm giving it a little over half, 13.5 volts. It loads up to -8°C, so the 226w pelt may work, load right around ambient. Not sure, though.

Edit: My 437w pelt draws about 13 amps at half voltage. The 226w pelt wouldn't draw nearly that much. You'd just have to experiment to see if the PSU can handle it.
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post #10 of 20
Thread Starter 
So...supposing I can get my paws on a PCP&C PSU with 2 34 amp 12 rails, what am I going to need to do this?

1 Apogee block
1 437W Pelt

Neoprene sheet(s)
Dielectric grease

What else?...
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