group buy for homebrew CPUs?
wdonzelli at gmail.com
Sun Aug 13 21:35:53 CDT 2006
> Very true...but I've looked far & wide for a reason for that
> specification to exist, and have found none. The only thing I can
> think of is the possible flattening out of the balls causing them to
> short against adjacent ones...but is that really possible? Not sure.
I suspect the spec may be due to what IBM found with SLT developement
in 1963 (which was basically BGA on a small scale) - having some
height allowed for a small moment arm, which was good for absorbing
the flexes due to thermal expansion as the chip heats up.
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