Big Pimp Daddy wrote:
As a side benefit, it takes a lot longer for water to heat up than air, meaning that short periods of high processor activity will not raise system temperatures greatly, hence no need to increase fanspeeds for a while. In my aircooled system sporadic high loads will cause the CPU fan (which is temperature controlled) to speed up and down as the load changes. This is a lot more noticeable and intrusive than a constant speed.
This is simply a matter of increasing the hysteresis of the feedback loop... or making the fan run at a steady speed just high enough to keep the CPU in this side of throttling at full load -- but then it will be way cool enough at all other times and probably still pretty quiet if you have a big heatsink.
MikeC, given the performance of today's supercoolers, where do you think the gating factor to best cooling performance is? Is it:
(a) getting the heat from the silicon to the metal surface of the CPU unit,
(b) getting the heat from that surface to the base plate of the cooler (whether water or air based),
(c) getting the heat from the surface of the base plate to the cooling medium (whether heat pipe or water),
(d) getting the heat from the cooling medium (whether heat pipe or water) to the fin array, or
(e) getting the heat from the fin array to the air?
It seems to me, just subjectively touching various parts of heat sinks, that contrary to my visual intuition, the fin arrays may be less critical than other, more subtle, parts of the heat sinks.