XP 64bit and Vista 64bit questions

I've got one computer to migrate to Vista Business 32-bit and one to migrate
to either XP Pro 64-bit or Vista Business 64-bit, but the questions involve
both platforms. One computer is a 32-bit computer running XPPro, with it's
printers shared out to a (second) 64-bit computer running XP Home 32-bit at
the moment. The first is upgrading to Vista Business 32-bit, and the second
one is going to upgrade to either XP Pro 64-bit or Vista Business 64-bit.

Will the computer ending up at Vista Business 32-bit have issues after the
upgrade sharing printer drivers with the 64-bit computer, or do I need to do
separate driver installations for both printers (assuming I get printer
drivers for Vista Business and XPPro 64-bit for both printers)? I would
assume that printer drivers if both machines end up at Vista Business will
be simpler.

What wireless cards are available that run under Vista Business or Vista
Business 64-bit? What wireless cards are available that run under XP Pro
64-bit?

Will the 64-bit machine show any performance improvement in running Doom 3
and Quake 4 <g>? It comes with 2 gigs of RAM and a 512-meg ATI Radeon X1300
card in an AGP slot, and ATI just released 64-bit drivers for the card. The
motheboard manufacturer has also just released 64-bit drivers for XP Pro and
for Vista.

 

You will need both 32-bit and 64-bit drivers for every device on your
system.

32-bit software will run in an emulation layer when running on a 64-bit
system, so I doubt you will see performance increases. Same to decreased
performance is the most likely outcome.

Can't answer your other questions - check out the models of cards you're
interested in and see if they offer Vista drivers or not.

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Unless those games have 64-bit versions, it's unlikely you'd see any
performance gain.