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Originally Posted by pHaestus
I'm still trying to make sense of your numbers RoboTech. Looking at the CPU testing I see an 8C rise over water temperatures. Comparing that to the die simulator that would put the heat load at a little over 100W. I find that rather hard to believe at 2000MHz and 1.65V.
Why not monitor wb inlet and outlet temps and insulate the hoses? It's a good sanity check on watts...
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Two things:
1) Actual testing on the XP-2400 was done at 24 C ambient, while the Thermal die tests were conducted with an ambient temp of 21. (different locations)
2) CPU tests used a "realistic setup" including bulkhead fittings and flow indicator. The thermal die tests were conducted with two short 12" tubes and no fittings or flow indicator.
My purpose for mounting the Reserator on the thermal die sim was just to see how the Reserator responded to higher heat loads - primarily wanted to see how hot the water would get...
nothing more (like new bench testing, and calculating C/W values).
If you take the 8C rise and substract 3C (diff in amb temps) that makes it 5C, which now correlates to ~ 63 watts - close to AMD's estimated max thermal output of 68+ watts, especially if you figure in secondary losses.
For now, I'm still using my current testing methodolgy so I can compare results to other systems tested on the same rig in the same way. If and when I can make the time (big IF right now) I may change over to a more analytical test loop as you suggest. And as you well know, trying to accurately measure the dT between water-in and water-out can be challenging!