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help TEC VGA

post #1 of 9
6/7/12 at 12:33pm
Thread Starter 
So, I've an AMD 7850 and I wanted to cool it using a tec. it has a TPD of 130W and a load temperature of 62ºC and idle 32.
I've red many posts about it but I'm confused about the calculations.

I want to use a mcw80-t or similar because it's an easy way to do it. Maybe if it's worth I could change the TEC unit.
I could reuse this in future builds with VGA's with similar TPD's.

I played around with ultrasonic2 calculator (thanks!) and I had some results.
I don't want sub zero temperatures but what happens when you power the pc? the gpu is cold, it won't freeze or something in a few seconds or minutes before it heats up?
How can I calculate the heat load that a radiator/fans cools?
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post #2 of 9
6/7/12 at 12:58pm
You can first test with a Ebay 50mm TEC (they mark it as "400W" on ebay), and you can use the computer power supply to power it (12V). At 12V, the given TEC consumes max 230W of power. I believe mcw80-t has the same copper base as the swiftech apogee XT, which is just large enough to cover a 50mm TEC. But if you run a TEC at a fix voltage without a controller it's actually impossible to keep the condensation away unless you insulate it. Note that the GPU is not generating 130W all the time. At idle it generates much lower power (<50W).

The heat load of the TEC-GPU will be the summation of power consumption of both, which you need to cool with your radiator.
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Obsidian
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post #3 of 9
6/7/12 at 2:18pm
Quote:
Originally Posted by __-_-_-__ View Post

So, I've an AMD 7850 and I wanted to cool it using a tec. it has a TPD of 130W and a load temperature of 62ºC and idle 32.
I've red many posts about it but I'm confused about the calculations.
I want to use a mcw80-t or similar because it's an easy way to do it. Maybe if it's worth I could change the TEC unit.
I could reuse this in future builds with VGA's with similar TPD's.
I played around with ultrasonic2 calculator (thanks!) and I had some results.
I don't want sub zero temperatures but what happens when you power the pc? the gpu is cold, it won't freeze or something in a few seconds or minutes before it heats up?
How can I calculate the heat load that a radiator/fans cools?


I made one for my 6850 a while back.. it worked pretty good.. and I had dewpoint protection with a controller..

http://www.overclock.net/t/1150610/tec-gpu-water-block
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post #4 of 9
6/7/12 at 2:23pm
Thread Starter 
Quote:
Originally Posted by Mindchi|l View Post

I made one for my 6850 a while back.. it worked pretty good.. and I had dewpoint protection with a controller..
http://www.overclock.net/t/1150610/tec-gpu-water-block
how much you want for that?
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post #5 of 9
6/7/12 at 6:21pm
Thread Starter 
so I checked those posts and those products but forget it. they are all great but that's just too expensive for me.
I'm better off with insulating the card and not using a controller.

I got it Power Consumption = Heat Output.
130W+230W I need to cool 350W.
dual or triple rad will work?

swiftech apogee XT as a base of 60mm and mcw80 and many others vga coolers have a base around 49.4-50mm :S would 50mm work?
would I need a smaller tec unit or to find a bigger waterblock?
Edited by __-_-_-__ - 6/7/12 at 6:23pm
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post #6 of 9
6/7/12 at 6:34pm
The tec I use only consume about 132 watts to move your 130 watt heatload. they are 199 couple tecs.

IMO stay away from the cheapo ebay 127 couple tecs that are power hungry at 12v and hard to cool.
Edited by Mindchi|l - 6/8/12 at 2:51pm
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post #7 of 9
6/7/12 at 8:47pm
Thread Starter 
you are right. I'll start by watercooling but I need to have in mind a TEC upgrade path for the future. This is for a micro atx case so I'll start with somthing with a good pump, a 240mm radiator, I'll add another one later if necessary, and a waterblock capable of having a TEC.
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post #8 of 9
6/7/12 at 10:17pm
I'd rather not see you waste money, especially if money is an issue. This is the most powerful 50mm TEC I could find on eBay. It has a Qmax of 150W, at 0dt. This means that with 130W you'll get maybe 5°C difference from water temperature, and that is if a 240 Rad can handle a TEC with heat output at 274W (TEC Heat + GPU). And then there's losses from your water block, might lose a couple degrees from that. Not to mention you have to sandwich a TEC between 2 plates to get the power of the entire TEC focused on surface of the GPU Die. It's just not gonna work.

I'm not one to shoot someone's ideas or attempts down, but when money is a big limit, I don't want someone to waste a hundred bucks on something that will probably not work at all. I'm not saying don't do it if you're curious, experience is always something good. I just wanna help someone out.

EDIT:
This is the most powerful TEC on eBay I could find. Going to see if I can find the right info for it

Info on this TEC is best matched with a TEC from CTE. At 12V it will do about 130W load with a 23-24°C difference from water. It will be pumping out 358W (GPU + TEC Heat). I'm pretty sure a double will not work for this load, but a triple radiator could.
Edited by Krow - 6/7/12 at 10:27pm
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post #9 of 9
6/14/12 at 6:22pm
A 360 for sure and preferably something that is a good quality. Possibly push-pull as well with the fans.smile.gif
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Double Vision
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