Lots and lots of bug fixes, but there's not a changelog that I'm aware of. There aren't any big changes as far as I'm aware - just lots of little ones.
The big single bug fix I know of between the two builds was Direct X, which occurred in 7127. Until then, games like Flight Simulator X, wouldn't run on my machine unless one used a hack.
I'd upgrade to 7600-16385 if I were you, just because that build is the GOLD RTM.
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