Quote:
Originally posted by freeloadingbum
Thanks, I must have missed that disscusion. It's interesting that lapping made such a large difference (more like ~3C). Think I need to go buy some sandpaper.
Edit: I just reread BillA's test and it seems to contradict what you just said. Do you have a link to where it was discussed that the block wasn't that flat?
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Hmmm, must've been thinking it as I looked at the pictures. Bill indeed said that it was slightly convex and very flat. (My apologies for misquoting you Bill). I do notice that it does fall away from the middle quite rapidly.
Compare BillA's MCW5000A picture (somewhat flattish all over), to BillA's PolarFlo (which has a rapidly falling gradient of non-flatness away from the very middle).
MCW5000A
PolarFLO
Maybe it's just a matter of personal interpretation. I don't pretend that I can do a whole lot better myself when I lap blocks, but I do believe that this is an area that does need more exploration.
Have heard some conflicting points of view on the matter of what's desirable. Some say convex, especially for the IHS chips. Some say very slightly concave for bare-die CPU's as CPU die's are very slightly convex themselves, and some say that as flat as possible is the best tradeoff.
I tend to agree with flat as possible,