Originally Posted by RavageTheEarth
Ok so I just attached the block and took it off and it didn't make contact with the sides of my CPU. I ended up pressing it down again, but the red lines I added to this picture shows where the block didn't make contact. Should I attemp to lap my CPU or do you guys think it is fine that it only makes contact with the middle since that is where the most heat is. I think when I wipe the TIM off and apply some with the pea method it will spread across the whole thing. I think it's just because I am using the pre-spread TIM on the block.
...this is also a regular topic as that happens a lot:
First, I would get some pressure paper to put between the block and IHS...it will more clearly show the contact patterns
Second, some IHS are curved just a bit (or a bit more than others), ditto for some CPU blocks...try to 'rotate' your block 90 degrees to deal with this concave/convex issue and remount on the IHS (perhaps with pressure paper as a test).
Third, undoubtedly, some folks are going to suggest 'lapping' the IHS and possibly the block...using increasingly finer grid sand paper (eventually up to 3000 if you can get it, i.e. automotive supply stores, though 2000 will do)...this can help as well, but you will remove all the markings of your CPU
Fourth, once you tried the 'rotation method' described above, using MX4 - and a bit more of it - than CL-U/P can also help as it is a bit better in shaping itself into 'cavities'
Finally, the pattern on your pics also suggest that there is a bit of an uneven 'mounting issue' (the 4 bolts that fasten it to the back plate) that may be joining up with the convex/concave items above.Edited by Joa3d43 - 3/25/13 at 11:32am