Quote:
|
Originally Posted by BillA
...consider it now from a different perspective:
which is greater; the variation in θjc or that due to θcs ? - and by what order of magnitude ?
I will not insult the readership by stating the obvious...
|
I'll play the role of the un-insulted readership.
I'm assuming that θjc is composed of 1) the IHS and 2) the tim joint (between it and the die). I would not expect much variation on that (I am ignoring proponents of 'otherwise', for lack of data).
pHaestus
last posted water block review data shows variations (due to multiple mounts, 5 to be exact) in the range of almost 0.4 deg C (on a specific wattage).
I vote for #2.
As for order of magnitude, I do not know the actual variation of #1; I'm assuming that it would depends on what varies, with would be the clamping pressure, and its geometry (i.e. from a non-flat water block, but that's really a stretch; the nickel plated copper IHS isn't going to flex a whole lot).
The only reference data (if it can be called that) that I know of, is those reported experiences from users reporting better temps (on bare die CPUs) by clamping the block way over the specifications. I have seen none for capped CPUs.