Peltier users's comparision thread

[Miss_Man]

Ran my Tbird 1333mhz AYHJA at different settings to simulate different heat loads to get a hold of how my dual 172 watt peltier rig performs. Cooling rig includes 2 172 watt peltier,powered at 22v each, side by side clamped between 6.5mm cold plate and custom-made 5/8" fitted waterblock. 5 Heatercores,7 120mm fans used on 3 pumps, actually 2 loops recycling reservoir water.
Tests ran with prime 95 loaded for around an hour at each setting and water temps and CPU temps stabilized. Temp of CPU is measured with in socket thermal probe that is bent upwards and applied with thermal grease. Should be giving rather accurate readings as before this, it was giving readings close to external probe used without running peltiers.

Ambient is at 28C in an air-con room. (Hard to get the aircon to get colder than this because I havent washed the filter for a long time + the heat generated by PC)

DeltaA refers to the difference between temperature of CPU and ambient.
DeltaW refers to the difference between temperature of CPU and water temperature just before the waterblock.


Speed Voltage Heat CPU Water DeltaA DeltaW
1000mhz 1.76v 50w -6C 31.0C -34C -37C

1200mhz 1.78v 60w -3C 31.0C -31C -34C

1350mhz 1.82v 70w 0C 31.1C -28C -31.1C

1470mhz 1.85v 80w 2C 31.1C -26C -29.1C

1554mhz 1.92v 90w 5C 31.1C -23C -26.1C

1620mhz 1.98v 100w 8C 31.2C -20c -23.2C

1680mhz 2.04v 110w 12C 31.2C -16C -19.2C

1720mhz 2.10v 120w 14C 31.2C -14C -17.2C

1720mhz 2.19v 130w 19C 31.3C -9C -12.3C

1780mhz 2.23v 140w 21C 31.4C -7C -10.4C

1740mhz 2.35v 150w 26C 31.4C -2C -5.4C


If the figures are a little too difficult to read, go here for the table
http://lardarse78.tripod.com/heat.htm
Notice that an extra 10 watts of heat usually rises CPU temp by 3C. My max stable overclock is 1790mhz at 2.25v full load 23C.

This would make it possible to estimate the CPU temp if I were to switch to an Athlon XP. Also, it makes it possible to compare the performance of peltier rigs.

If I were to be using an Athlon XP at 1800mhz at 1.80v (70w) at an ambient of 22C, my CPU temp would be roughly -6C at full load.
If I were to run an Athlon XP at 2044mhz at 1.84v (80w) at an ambient of 22C, my CPU temp would be roughly -4C at full load.
Pretty vapochill-like results eh?

Any data from other pelt users?

[resago]

sig says it all.

[Brad]

water temp hardly rises, indicationg you have a great radiator and pump setup.

I do think your temp rises a bit too much for the increase wattage though

[Miss_Man]

Here are the graphs
http://lardarse78.tripod.com/heaty.htm

Dunno bout that, but it seems consistent with the results from Les with his 220 watt peltier. Its so linear that I can predict what my temps are at 40w and 160w without actually running it.

[Brad]

yeah, at least being linear you can figure it out.

Do you know what the hot side of the pelts is?

[QazTaz]

hmm..... I'm getting ~27*c with one 156w (xp1333@~1750@2.1v)... (I'm not quite shore if that was100% full load, the system is down for now... probaboly upp this evening...)

the 156w pelt is running on ~15.5 (15.8 is specifided for them)

the waterblock is home made and is 10*c over watertemp, water ~30c (damn small room, get over ~28*c in there, and it's ****in winter outside and no other heating... )

coldblate is 8mm

a pick (without the pelt tho):
http://w1.858.telia.com/~u85821090/block01.jpg

http://w1.858.telia.com/~u85821090/block01b.jpg

edit, two different pics.....

[Brad]

not only is that block a cool design, it looks very professional too, your temps are maybe a little high, but nothing too bad

[Miss_Man]

That is a very neat design. Just like the way heatercores work, must have taken quite sometime to mill. Maybe if you made it a little thicker, might work even better. With a 156 watt pelt, thats about the temps I would expect.
I have compared my rig to a few others at tekheads forums who are using either 220w pelts or dual 172s, and my temps are quite a bit better, my bet is on my waterblock. You can see the comparision graphs here.
http://www.tekforums.co.uk/posts.php?threadId=7189
My rig set up is here.
http://www.overclockers.com/tips800/
I have since switched to AS3 and temps are about 1-2C better, not a lot but enough to note a diff.

[QazTaz]

the temp's quit to high, i know... :(...

I got a strange very high drop between core and coldplate, it's 15*c between the edge of the coldplate and the core, and thats too mutch.... I don't know exacly whats the problem is, but the core on my xp1600+ isn't 100% plane.. it's like a big sphere... I have to fix a rig to grind it plane...


to the waterblock, it's designed for an other project, this is just a step on the way.... I atempt to use a cubic coldplate of solid copper (52x52x52mm) and 4 156w pelts, with one block each, and that's quite tight... so the block is designed to be small (50x55x13mm)... all to keep cool at hich Vcore's...


the coldplate on the pictures is just a test rig... next step is 2 pelts...

a singel 156 can't handel the XP @ over 2.1v... so 2 is on the way... :)

[Miss_Man]

Then may I suggest 2 172 watt pelts instead? Cos the 156 are 50 by 50 and you will have a hard time fitting two side by side with capacitors near the socket.

[QazTaz]

well... moving a few capacitors is the easiest part of this I think....

but tight as hel is it...

(anyway, 2 isn't enough... :))

[Brad]

yeah, you'd be better with 120w or 172w pelts, they are 40mm, although they do want 24v for full power. To have 4x 50mm pelts would take up a serious amount of room

[#Rotor]

This Might give some idea of how nice it is to be able to set the voltage to ones TEC's right down to the millivolt :)
http://3rotor.dns2go.com/images/r&d/TEC-driver/Animation1.gif

[Brad]

nice work there rotor, but I still prefer your Quattro (http://3rotor.dns2go.com/images/Turbulator_quattro/DCP04488.JPG)

[#Rotor]

:) I do Too , unfortunately Tyan had this very clever brainfart, that of not giving us the holes around the sockets on there S2460 motherboards.... So I had to go dig up some old blocks out of a box , to get my rig up and running.... but it's running and running well :)

http://3rotor.dns2go.com/images/Project_S2460/index.html

[#Rotor]

Errmmm....So howcome my pictures don't show???? oH I know, I'm a MOOB..... :) that must be why J\K

[Brad]

thats crap :P look at my maze2 on a vp6 thread in the liquid cooling section