pH results compared to mine on the Maze 4
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I am a little disapointed that my numbers are so far off on this first attempt. Not to sure why mine flattens out so much.
Note the numbers I used for pH are pulled off the water blocks graphs so they might be off a .1 or so. Any way I am going to remount and start over. |
It's probably because you're measuring temps under the CPU core Jaydee.
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Here are the second round results. The Dt is a little lower because of the increased mounting pressure. As predicted the results are the same which is good as that means things are running failry consistant. I got my King Pin block on now and warming up the system
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Another with the Abit KD7 with the XP1700+ @ 1667mhz 1.75V with my KingPin block and pH's maze 4 numbers. I am still running flatter curve. Has to from the temp under the CPU.
I am replumbing the system now with the Cole Pamer YSI RTD's for water temps. |
interesting example of the non-correlation between resolution and accuracy
lol get the thermal mass out of your system, all of it |
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you are looking at the compression of the temps
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Following the Artic Silver article above for reference;
1667mhz @ 1.75V CPU: 42.43C Water In: 26.94C DT: 15.49C ----------------------- 667mhz @1.75V U: 33.50 Water In: 25.52C DT: 7.97C ----------------------- 1667/667 = 2.5 15.49/7.97 = 1.94 Shave 3C off; CPU 39.42C Water In: 26.94C DT: 12.49C CPU 30.50C Water In : 25.52C DT: 4.98C 12.49/4.98 = 2.5 So can I conclude I need to subtract 3C from my CPU measurments? |
different issues
cal is one thing (you may, or not, be correct; does not matter unless you are after absolute values) compression another |
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Take a stab at the "goodness" of your results by calculating a W for the CPU using the dT across wb. It should be mostly flat because the wattage doesnt change. It wont be perfectly flat because as you lower the C/W then more of the CPU's heat goes into the wb and less into the traces of the board. You'll also find with a "below CPU" sensor that there's another problem. There's a baseline temperature that is difficult to go below because the air near the mobo is heated up by the mosfets and other bits all around it. This tends to make good wbs all perform even closer to one another than you'd expect. It's basically the same problem as with using an insocket thermistor, it's just slightly less pronounced. I had all kinds of trouble trying to use an undercore probe with the MCWCHILL tests if you'll recall.
If you want Jaydee I'll solder you up a spare 6657 and CPU. I'm not sure exactly what chips I still have around the house as spares (maybe a 2500+ Barton and a 1200MHz Morgan Duron or something like that?) |
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15.49/67.49w = .229 7.97/27w = .295 After the calibration above; 12.49/67.49w = .185 4.97/27w = .184 My math in the previous post seems to be .01C off a times for some reason though. |
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Just for the hell of it I think I am going to hook the die sim up tonight like I have it. It isn't even close to being finished but I think I can get better results as it is than trying to get decent results under the CPU. Bad part is I only got about 36watts of power. Was enough to get the sim to 160C and melt through plastic though (doh, don't leave hot things unattended!). Once I finish another run with the maze 4 I will get to it.
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Heh, well I hooked up the die sime last night. I thought I could get 36watts but i forgot the heaters i have are 40VDC 150watt and 10.7ohm... With the supply I got it is running 13.8V. So that comes out to about 18watts of heat load.... My dT is like 6C at 1GPM..... So when Radio Shack opens up I am going to buy 2 12V (13.8V)@15a power supplies and hook them up in series to get 24V (well 13.8v x 2 actually...27.6V).
27.6V/10.7ohm = 2.58amp x 27.6V = 71.20watts. Right? |
I got the die sim hooked up with 71-73 watts of power. I tell you what I don't see it possible that the benchtest.com calculator is even remotely accurate (even less than I inticipated). When I fired up the power supplies the die sim temp started shooting up rapidly past any high temp I ever got even at .4gpm. Right now it is as 52.12C (dosn't count secondary losses either) and still warming up a bit with the Maze4 at 3.6GPM and water temp at 29.98C and climbing. I guess I better turn up the Delta 120 to full speed so the pump doesn't lock up. I will stop logging the temp and turn the fan up and show a graph of the rapid temp rise.
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I knew it was going to be hotter but I was not expecting that much. (graph software sucks)
http://www.customcooledpc.com/testbe...esimheatup.jpg |
lol
diesel hp jd, got the real thing now |
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This is lots better. The curve is actually resembling pH's. :) The higher temps are interesting though. We both are supposed to have 71ish watt heat load yet my temps with the die sim are considerably higher.
Anyway attached graph of mount one. |
Could be that you're giving it more power then you think. How are you measuring the power dissipated? I assume you're using the warm voltage drop squared over warm resistance? What kind of meter?
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On this second mount I am going to use more load pressure. I got my micrometer set at the spring height this time so I can reset the springs the same on each mount. I might not of had enough load pressure on that first mount. Springs were not to tight at all.
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So are your milling capabilities good enough to make pH a die sim now JayDee?
Also are you planning on doing reviews fairly regularly? Someone asked me for a reference about you as a reviewer yesterday. It doesn't take long to become this site's premier wcing tester I think as long as I'm not doing anything and incoherent is quiet :) |
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