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post #41 of 748
s939 Opteron Quad Heat pipe over TEC #12715 @ 2.8ghz 1.584 cpu v-core.

Nice and cool below ambient temps. With a water block, this baby would be frozen.

post #42 of 748
I never planned to run that 19918 TEC at 24v haha, its quite good at 12v x 8a though, good enough to cool the pentium anyway, just 50x50mm is too big, so the 12715 40x40mm TEC it is tongue.gif

Yeah I better use the second PSU just to be safe, for testing anyway, it's not as good a PSU, I'll test for a week or so and then decide if I can get away with just my main PSU biggrin.gif I have a 50x50x3mm copper cold plate and I have to make another 40x40x3mm copper cold plate for the 12715, plus I have everything I need to insulate so I can let this puppy run all out. I also bought that Manual PWM controller I listed on ebay so I can turn it down a bit if I don't want the hassle of worrying about condensation, although I'll then be worrying about fire from the Mosfets haha. I have a 320mm rad with 1150rpm fans on it and a D5 pump, I can put some better fans on it if need be. With the 12715 TEC at 12v x 11a thats only 132w heatload, plus the ~75w my CPU will put out so I'm only about 207w total heatload so I think I'm good for rad space and fans. I may modify my CPU block to suit the TEC better though, it currently flows right into the centre, but there is a small reversible panel so that the fittings connect to opposing corners of the block for large compression fittings, but it still diverts flow to the centre of the block, so I will have to drill out the brass under the corner inlet position to get more even flow over the TEC which is quite important to keep all parts of the TEC hotside as close in temp as possible.

good to see how that 12715 does with just a heatpipe cooler shrimp, I'm looking forward to getting mine and putting it under water. That 3700+ is a 85.3w TDP right? so that should be a good sign for my 53w TDP pentium. If I push up to 1.55v and it's under water hopefully I'll still see subzero cold plate temps as it should still be quite a bit lower TDP than your 3700+. are you running the TEC at 12v shrimp?
Edited by LiamG6 - 9/28/15 at 2:01am
post #43 of 748
Thread Starter 
I reckon you need a 15volt 20 amp psu a 50x50 water block and a 50x50 6-8m cold plate wink.gif
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post #44 of 748
15v PSU for the 12715 or the 19918? 15v on the 19918 would be a nice bump in Dt or Qmax but I can't be bothered with a second PSU long term unless it was for a TEC chiller, but as I've stated previously I never think it's a good idea to run TEC's at Pmax so I wouldn't run the 12715 at 15v, efficiency goes out the window and they create way too much heat for very little extra DT or Qmax. Even running my 12715 at 12v will be breaking my rules a little bit. The 19918 at 15v would be quite good though, similar power usage as the 12715 at 12v but better Dt or Qmax at same Dt.

As for cold plate thickness, I've heard thicker is better but I'm keen to test this 3mm thick copper cold plate and see how it behaves with extended and burst CPU loads. I think it will be fine because I'm dealing with such low heat load and low heat density.
post #45 of 748
Thread Starter 
15volt 20 amp on your 24v 19918 and the 8mm would give more stable temps it wont go up n down all the time like a 3mm would, as it is the same as a water chiller more water chilled to 10*c is better then less water at 10*c as it stables out and gives better controls over temp best thing is chill the plate before turning pc on aswell as then it could help with booting at high voltage for screenshots
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post #46 of 748
If I can get hold of a bigger chunk of copper I'll have a go at hacking it down into something useable with a 50x50mm top surface and chamfered down to a 30x30mm to contact the IHS. I'd be happy to use the 50mm TEC then.

I know the thicker cold plate (~8mm) would hold temps more stable through small load/temp fluctuations but I'm curious to test the 3mm thick one, I can understand the 8mm thickness to hold steady temp through short bursts of high CPU load but for sustained high CPU load I feel that the thinner cold plate would actually transfer heat better/faster. I don't mind a bit of cold plate temp fluctuation as long as I can move that high heat load away fast when I really need to, so in that case I think thinner is better, there is only so long a thicker piece of copper can stay cold, it will in turn become saturated with heat from the CPU if the TEC is struggling to pump the heat away fast enough and it will then in turn take longer to chill back to where I need it, thinner means more fluctuation in cold plate temp but returns to the coldest temp faster and can hold sustained high cpu load at a lower temp than a thicker piece of copper, and when the CPU is at sustained high load is when I really need that heat transfer to be at its best to keep that cold plate as cold as possible

As for the 15v PSU, meanwell has just about everything but I'm not real keen on buying another PSU unless it was for a full blown chiller, for direct die I'd prefer to keep things as simple as possible. I'm happy to use my second 12v ATX PSU to run the TEC, pump and fans to do some pre chilled cold runs with higher voltage on the CPU but really I want this to be a simple daily rig so hoping to avoid too much complexity.
Edited by LiamG6 - 9/28/15 at 6:55am
post #47 of 748
Thread Starter 
Quote:
Originally Posted by LiamG6 View Post

If I can get hold of a bigger chunk of copper I'll have a go at hacking it down into something useable with a 50x50mm top surface and chamfered down to a 30x30mm to contact the IHS. I'd be happy to use the 50mm TEC then.

I know the thicker cold plate (~8mm) would hold temps more stable through small load/temp fluctuations but I'm curious to test the 3mm thick one, I can understand the 8mm thickness to hold steady temp through short bursts of high CPU load but for sustained high CPU load I feel that the thinner cold plate would actually transfer heat better/faster. I don't mind a bit of cold plate temp fluctuation as long as I can move that high heat load away fast when I really need to, so in that case I think thinner is better, there is only so long a thicker piece of copper can stay cold, it will in turn become saturated with heat from the CPU if the TEC is struggling to pump the heat away fast enough and it will then in turn take longer to chill back to where I need it, thinner means more fluctuation in cold plate temp but returns to the coldest temp faster and can hold sustained high cpu load at a lower temp than a thicker piece of copper, and when the CPU is at sustained high load is when I really need that heat transfer to be at its best to keep that cold plate as cold as possible

As for the 15v PSU, meanwell has just about everything but I'm not real keen on buying another PSU unless it was for a full blown chiller, for direct die I'd prefer to keep things as simple as possible. I'm happy to use my second 12v ATX PSU to run the TEC, pump and fans to do some pre chilled cold runs with higher voltage on the CPU but really I want this to be a simple daily rig so hoping to avoid too much complexity.

my pc will be portable with 3 extra psu's 2 rad boxs chiller res 2 pumps loads of fans lol but then again aim crazy.. biggrin.gif
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post #48 of 748
Thread Starter 
Things left on my list are,

1. Build the res and insulate it
2. Buy some thermometers 1 for hot side 1 for cold side
3. Deionized water and antifreeze to mix 8L
4. Temp controller for cold side will be very simple temp controlled relay to power on or off for tec's psu's set to around 14-16*c to cut out little bit of condensation
5. 360 Rad box when it arrives and mount it to case somewhere
6. Buy and build my custom 1200 watt psu 3 12v rails 96 amps total plus 5 volt 5 amp each rail for a later date upgrade to 6 12715 250w tecs
7. Figure out how to fit this all in to one pc and still move it after
8. MY ELECTRIC BILL!! 2000 watts of pc later..... oh yea need to buy some energy efficient light bulbs no tv ever again but will be worth it wink.gifbiggrin.gif
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post #49 of 748
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more delays yay............... frown.gif 😭
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post #50 of 748
Ouch eek.gif
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