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Interesting reply from Noctua regarding lapping

post #1 of 2
Thread Starter 
I asked Noctua support about any experiences they have had with their coolers (specifically the NH-D15 which has a slightly convex base) on a lapped IHS. I got this reply:
Quote:
Apart from that, lapping the CPU/ IHS outside the socket doesn't help, as it gets deformed once installed inside the socket. If you would like to have the best performance with a lapped heatsink, you would have to flatten the CPU when it is installed inside the socket.

I was honestly quite surprised by this, as I didn't think the force holding down the CPU was strong enough to do that. Thinking more about it I guess it makes sense because we are talking about very small changes (fractions of a millimeter) in the first place, at least on modern CPUs. This could explain the very mixed results people get when lapping their CPUs.

I'm assuming it's very hard to properly lap a CPU sitting in the socket already without special equipment, so is it really just pointless to lap heatsinks nowadays?
post #2 of 2
or you can losen the socket clamps
and let the cooler retention mechanism to apply the pressure needed to have a good cpu-pins contact

as it was done in case of delidded cpu (without his) + waterblock
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