Pro/Forums - View Single Post - My micro-channel concept block

Cathar · 09-26-2002, 10:05 PM

If the temperatures are offset by 10C as I proposed, this would lead to C/W figures that are consistent (at least for these two data points).

I have a 3rd data point to add to the mix.

CPU @ 1608MHz/1.77v = 69.6W (6C rise above water)
CPU @ 1826MHz/1.87v = 84.1W (10C rise above water)
CPU @ 1925MHz/2.15c = 114.5W (18C rise above water)

Wattages found using the ComputerNerd calculator. Full load done using BurnK7.

Now those values don't make sense, but if we add 10C to each:

16/69.6 = 0.230 C/W
20/84.1 = 0.238 C/W
28/114.5 = 0.244 C/W

Throw in a +/- 0.5C variation on the measured CPU temps and it all falls into line (more or less) within expected behavior.

I'd say for this particular motherboard I own, I may as well bump the CPU die temperature compensation by +10C and I'd probably be pretty close to the mark.

Interesting too, as 0.23-0.25 C/W values would come close to fitting it with Les's hypothesised C/W values for the block itself + the ~0.15C/W for the thermal paste barrier.

09-26-2002, 10:05 PM	#36
Cathar Thermophile Join Date: Sep 2002 Location: Melbourne, Australia Posts: 2,538	If the temperatures are offset by 10C as I proposed, this would lead to C/W figures that are consistent (at least for these two data points). I have a 3rd data point to add to the mix. CPU @ 1608MHz/1.77v = 69.6W (6C rise above water) CPU @ 1826MHz/1.87v = 84.1W (10C rise above water) CPU @ 1925MHz/2.15c = 114.5W (18C rise above water) Wattages found using the ComputerNerd calculator. Full load done using BurnK7. Now those values don't make sense, but if we add 10C to each: 16/69.6 = 0.230 C/W 20/84.1 = 0.238 C/W 28/114.5 = 0.244 C/W Throw in a +/- 0.5C variation on the measured CPU temps and it all falls into line (more or less) within expected behavior. I'd say for this particular motherboard I own, I may as well bump the CPU die temperature compensation by +10C and I'd probably be pretty close to the mark. Interesting too, as 0.23-0.25 C/W values would come close to fitting it with Les's hypothesised C/W values for the block itself + the ~0.15C/W for the thermal paste barrier.