Originally Posted by mailman2
The flatter the better. If you finish it too smooth the TIM will just run off with high heat. I've had this happen. You dont want a mirror finish on the chip, trust me. Doesn't sound like you've been doing this too long, but you want a flat finish with 600 or 800 for the best results. I've tested with multiple water blocks and many many chips over the years.
if this is the case then you were using too much TIM.
transport fundamentals says a higher grit (smoother) flat finish will have better contact and better heat transfer.