Tjingsted

Hey,

I'm about to do my first TEC cooler.
I plan on cooling my CPU (PhII 940) with a TEC and cooling the TEC with my watercooling (240mm + 120mm rads).

I would place the TEC under the EK Supreme, and then make a copper plate to go under the TEC cooler.
(In my diagram Thermal paste would be the ____'s )

EK Supreme
___________
TEC
___________
Copper Plate
___________
CPU


Would that be fine?
Also the Tec I would use, would be this (This is the most powerful peltier I could find in DK):

Peltier element, 40x40mm, 12V, 8,5A (102W)
Model number: BN202114
Measures: 39,6x39,6x4,16mm.
Volts: 12VDC (Max 17,5VDC)
Amp: 8,5A
Temperature difference: 65 gr. C. (Max 72 gr. C.)
Model: 6300/127/085

Could I get 0C with this TEC + my Watercooler?

__________________

Ultrasonic2 (muffy)

Hey,

I'm about to do my first TEC cooler.
I plan on cooling my CPU (PhII 940) with a TEC and cooling the TEC with my watercooling (240mm + 120mm rads).

I would place the TEC under the EK Supreme, and then make a copper plate to go under the TEC cooler.
(In my diagram Thermal paste would be the ____'s )

EK Supreme
___________
TEC
___________
Copper Plate
___________
CPU


This is fine


Peltier element, 40x40mm, 12V, 8,5A (102W)
Model number: BN202114
Measures: 39,6x39,6x4,16mm.
Volts: 12VDC (Max 17,5VDC)
Amp: 8,5A
Temperature difference: 65 gr. C. (Max 72 gr. C.)
Model: 6300/127/085

No this isn't anywhere near powerful enough especially after you over clock it


Could I get 0C with this TEC + my Watercooler?
No currently available tec will get you to 0 at load on all 4 core while using a direct die system. with an ambient of say 25c ( my disclaimer is i have no idea what wattage your cpu uses and im used to cooling INTEL chips )

__________________

Tjingsted

What kind of temps should I expect with the 102watts TEC?
10C at load or 20c or 30c or?? (ambient is 22C ~~)

What if I put them side-by-side on the copper plate?? Like making them into one 40mm x 80mm TEC.

EK Supreme
___________
TEC + TEC
___________
Copper Plate
___________
CPU

Would this give me a 200Watt tec???
What temps should I expect from this?

__________________

Scarlet Infidel

Think that CPU uses 125w at stock and more like 200w at the speed you have it at.

That peltier will leave you with very high temps, much higher than watercooling alone. It just isn't powerful enough. Try eBay and look for larger peltiers from China.

Tjingsted

WHAT?
My 940 isn't ever gonna use 200watt?
Don't you think that 2x 103watt TEC's would be enough?

__________________

Scarlet Infidel

I was using this tool.

It is a heavily overclocked, top end, quad core CPU. What do you expect is to use? What voltage do you have it running at?

Of course that is a maximum figure that you will never achieve even if you have 100% utilisation on all 4 cores (which is rare). Also a lot of heat is lost through the back of the motherboard etc.

Edit:
The chip uses up to 125w at stock. This, hastily found, graph shows real world figures around 100w.



Now power scales linearly with clock speed and squares with voltage.

zipdogso

Tjingsted...

You must remember also the 102w is absolute max at max power (17v) in ideal conditions with a DT of 0 and NO load.

In the real world with good quality parts and TIM etc at 12v you may only get 80w per TEC if that...probably less.

Tjingsted

Okay.... I heard ya... But 200watts are tooo much. That is almost 175% and I'm only giving it like 40% more volts...

But please tell me what would 2 x 103watt tecs (direct die) give me? Ca. 10c load?

__________________

Scarlet Infidel

I don't think that is how they are rated.

If QMax is 102w at some set temperature (e.g. 300K) then it means that at this temperature the unit can move 102w with dT of 0K.

The only figure stated with no load is the max dT which is usually 69K (again at 300K) for a 127 couple module.

As I said increasing clock speed gives a linear increase in power and voltage increase gets squared (e.g. double the voltage gives 4 times the power).

So if your CPU uses ~100w at 3GHz/1.2v it will use

128w at 3.84GHz/1.20v
144w at 3.00GHz/1.60v
227w at 3.84GHz/1.60v

196w at 3.00GHz/1.68v
250w at 3.84GHz/1.68v

zipdogso

This unit is a 12708 look at the bottom of the specs.
These Tec's are manufactured by just about every maker going and the general Qcmax at 25ºC is 80w. I believe the 102w is at 50ºC...I might be wrong.
based on this I am actually being quite generous in my estimation.