Originally posted by: bwanaaa
well, i went to microsoft and here they compare xp to vista:
I think you've gone and confused yourself. Your trying to compare 'x64' to Vista' x64 is a platform, it's the 64bit wintel platform. Your really asking, what is the difference between XP x64 and Vista x64. And the answer is, basically the same as the difference between XP and Vista.
"Althought the comparison is not directly made on M$'s site, it seems that vista is x64 + some extras-"
Again, x64 is the platform, not the OS.
OTOH, it seems that x64 is more compatible with x32 apps (at least that's their marketing-speak)
Not sure where you get that from, both XP64 and Vista64 have about the same base level of compatibility. However, since we are seeing drivers for Vista64 being delivered and Xp64 is now orphaned, Vista64 will be the most compatible from now on.
Bill