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You either misread or misunderstood what I was saying or didn't follow my original post link, I never said or meant to imply " that adding passive heatsinks is a bad idea or a disfavorable one " I said almost the opposite in fact ..."I'd agree with you in
MOST situations"
I've quoted the relevant text from that linked topic below:-
Quote:
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I too noticed the heat of these on my NF7-S and tried a heatsink (modified P3 slot) without much improvement. I then made a waterblock that has solved the heat of the fets and associated components in the area. It seems whatever you do someone has always beaten you to it. I water cooled mine a while ago and I'm sure I'm not the first to do it either. In a fanless system I was getting around 80°C naked, 68°C with sink, and 33°C with waterblock. For retention I also used epoxy, (artic sliver), but mixed with AS3 so it remains a little rubbery. This should allow me to be able to remove it later without ripping components from the PCB.......in theory at least, (I mounted the heatsink the same way and that came off with some gentle prying)
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My point is the sink I used did help a bit, but not enough to make it a solution for me in a zero fan system. Heatsinks by their nature absorb the heat but if there is very little air movement around the sink area to remove the heat, it can get overcome with the heat itself and heat up to near the same temp as what it's cooling. This is what I found with my system, not opinion just a fact. I'm sure a small low speed fan would have helped a lot, but no fans allowed..........
As you say in using a sink there should be less heat for the component it's mounted on than with no sink, but it did make the caps get hotter probably because of the way I drilled hole relief's in the sink for them, which meant they were enclosed by the hot sink.
I guess I could have persevered with bigger and different passive sinks, but knew a small simple waterblock would solve the issue completely, not only cooling the fets but the whole area. It wasn't much of a problem to add in due to my split distribution set-up.
I think a lot depends on how hot the fets get on a particular mobo, on my NF7-S 2.0 they seem to run very hot, certainly much hotter than any previous mobo.....