need to cool it more

[Orac]

hey you all i am thinking about dabling with a tec for cooling CPU a little more and need some advice.

i have a heatkiller rev3 with a blackice gts240 rad and apha cool 1000l/h pump/res

from what i understand with my CPU reaching 61 under load and a tec running at 158W i should get a theoretical -41. this seems about right bu tell me if i am wrong

now with a 158w tes and 211 watts from an OCed phenom II (1.55v-core at 3.8) means 369 watts for my loop to cool - is it gonna be able to cope with that. i have a seperate PSU to power this thing so providing the tec doesnt exceed 12v/25amps its fine. also whats gonna happen is forget to switch on the PSU for the tec - is bad stuff gonna happen

[rockdude14]

http://forums.extremeoverclocking.co...ad.php?t=36894

read through this sticky

I think you will see why you wont get -41

with a tec smaller than your cpu load you will actually cook the cpu

[Orac]

OK, so i got something wrong there - math wise. i have found a 232.5W. the only issue i have is the current draw will be more than the second PSU will handle.

now if i got the math right the cold side should be 45 degree lower than the hot side making the CPU 15 degrees under load... is that right????

its TEC1-1272 in the chart
http://www.taileng.com/en-temodule.html

[rockdude14]

not sure which tec your talking about there isnt a tec1-1272 on that list
did you mean 12720

this is the formula that will give you your temp

Delta T = (1 - (Heat Load/Max Cooling Power)) * Max Temp Difference

*) Delta T = The actual difference in temperature between the hot-side and the cold-side that you should experience in the real world.
*) Heat Load = The heat generated (in this case) by the processor measured in watts.
*) Max Cooling Power = Maximum TEC rating in watts. (e.g. a 221-watt TEC or a 80-watt TEC)
*) Max temp = TEC’s maximum temperature rating in degrees C (theoretical Delta T, a.k.a. Delta T max).

so if you have a heat load of 211watts and a tec that cools 177watts

you get a delta T of -20degrees so you will be heating it up
you need to have a tec atleast as powerful as your heat coming off the cpu just to get a delta T of 0


i think your estimate of 211watts for your phenom is way to high but maybe someone else can ring in on that

[Orac]

sorry i meant 12726

these are the detials hes listed (it ebay so cant link it)
Type: TEC1-12726
400W
12V
Couples: 127
Imax (A): 26
Vmax (V): 15.4
QCmax (W) 177.8
Tmax ˚C: 68
Dimensions: 50 x 50 x 3.65mm (2 x 2 x 0.15")
Wire length: 101mm (4")
Fully sealed for protection against moisture

Additional Comment:

i used this here calculator thing to find 211 for my CPU
http://www.antec.outervision.com/

Additional Comment:

this list may be closer, the 12726 has the same dimensions as the one i am looking at.

Additional Comment:

man i am dumb - i found where is was going wrong i was using my load tmep (ie 61 degree c) instead of 211w - der