Quote:
Originally posted by pHaestus
What I am concerned about here winewood is that adding an IHS to the die simulator IS going to increase the variance in the results. It IS going to be affected by the aging of the paste inside as it dries/settles. It will dramatically be changed by remounting the IHS. So in my opinion any testing with one is going to introduce more problems than it is worth. I see this honestly as the same argument that the uneducated use to advocate "real world testing" with CPUs.
And a 40mmx40mm TEC is a very different heat source than a CPU. A TEC truly will have the heat spread through the entire surface while the IHS will not. I still doubt that the lateral heat transfer is all that great. If the IHS could truly efficiently spread heat across its total surface then one wouldn't gain such big temp drops by pulling it off.
I mentioned these points already.
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1) What I am concerned about here winewood is that adding an IHS to the die simulator IS going to increase the variance in the results. It IS going to be affected by the aging of the paste inside as it dries/settles. It will dramatically be changed by remounting the IHS.
I agree the aging of the paste etc will cause more trouble than it’s worth for what we are trying to get. Although one could argue that this also happens on a real CPU.
2) I see this honestly as the same argument that the uneducated use to advocate "real world testing" with CPUs.
Again I agree no way a true C.W could be obtain using a real CPU but it is the only way to test on – a real CPU. So it has some value but not with obtaining a C.W
3) And a 40mmx40mm TEC is a very different heat source than a CPU. A TEC truly will have the heat spread through the entire surface while the IHS will not
Again I agree. So why are you just testing a area of about 10 mm x 10 mm when you should be testing a area of about 40 mm x 40 mm to better simulate the new CPU’s
After all the purpose of this type of testing is to try to predict how a block would work on CPU putting out a certain heat load over a certain area. I am sorry to wake people up here but that area is no longer 10 mm x 10 mm and to call your simulator a CPU simulator when CPU’s are no longer being made with an exposed core? I agree with winewood if you are going to simulate a block on a CPU then the area that emits the heat should be as close as possible in area to that of a real CPU (with IHS) with the heat being produce in the center.