Originally Posted by ckybam3
I am not lapping my cpu due to the pins being attached to amd cpus. That being said I appreciate your information. I think I am going to start at a lower grit because when I look at the thing it looks flat but its definetly not smoothe. I can run my nail across it and feel grooves which is unacceptable. I am even getting worse temps with it than my lapped TRUE gave me (granted the as5 hasnt cured yet and I need another yate loon for the push pull to be better).
Luckily the pins on AMD processors are attached with a ball and socket design so they can be straightened very easily with a metal nail file run through the rows. IDK about Intel.
If you want to smooth things you use a higher grit. Remove smaller amount of material to just remove high points.
If you want to flatten them you use a lower grit, lower grits remove more material because they are coarser. They grab larger chunks of material.
Any groove that you can feel with your nail is either very wide or very deep, either way it will take a fair amount of material removal.
Take a piece of known straight metal like a piece of flat bar from a hardware store and shine a light back towards you between the flat bar and the H50's heat-sink and you will see light.
I'm not trying to sell you one doing a full lap, just telling you how it is. It's flat compared to $12 microcenter coolers, but my ole' Rosewill RCX-Z2-EX cooler was much flatter than the H50 though-less smooth though.
I'm a mechanic by trade and when rebuilding engines and you find a groove on a crankshaft journal you can bet that if you can feel it with your nail it is quite deep or wide(in relative terms).
Thousandths of an inch of extra TIM and less copper-copper contact can decrease cooling ability greatly. Here TIM is like an insulator compared to copper, more TIM and less copper contact=less efficiency.
posted on Techpower up does a pretty good job of explaining it.