Originally Posted by nleksan
I would really recommend PK1 over IC7, as the performance difference between the two is indistinguishable (I have seen PK1 outperform it), and IC Diamond will remove the writing on the chip's IHS, possibly creating warranty issues, and negating the ability to use the Intel Overclockers ProtectionPPlan.
PK1, Phobya HEGrease, and if you want to get extreme with your TIM, Liquid Metals will all be better options.
Liquid metal has a very high chance to damage your chip, IC diamond does not. For this reason alone, IC diamond is better for "extreme" cooling - at least as long as you intend to use the chip after your bench run. Suppose liquid metal is good for suicide runs if you have that kind of money to blow.
Also, IC diamond doesn't really remove your IHS writing. It might fade it a bit, but it's still perfectly readable (at least mine is after several re-seats).
At the end of the day though, you're right. There isnt much point to IC Diamond for normal
use with well finished blocks. Not because it isn't great, but rather that with normal use, pretty much all modern TIMs have reached the point of diminishing returns, and IC Diamond is just more expensive and harder to apply.