[H] Gaming in Vista or Win7..does it matter?

[Winterlight]

I have a 3 monitor setup.... one 30 and two 24. I run Win7 Pro 64 
bit. My previous OS was Vista 64 and when I upgraded to 7 I did a 
clean install, but kept Vista on a separate partition and now I dual 
boot. I always like a second OS in case something goes wrong. It 
makes it very easy to tell if I have a hardware or software issue, or 
if things go south I can keep working until I have the time to deal with it.


I have been running a Sapphire 5770 for the 30 inch and a ASUS 4970 
for the two, 24s. I just picked up another Sapphire 5770 so now I 
have two near matching video cards. I am not going to change anything 
in my primary setup other then to replace the too big, too hot 4970, 
but I am thinking about  my Vista setup as  Crossfire. That way I can 
boot into it to play games, and hopefully, I can play across the 
three screens... or is this not doable? I am not a gamer particular 
but this might be interesting.

Is Vista 64 just as good for multi monitor gaming, or just gaming in 
general, as Windows 7 Pro 64? Or would I be better off removing Vista 
and installing a clean Win7 64 Pro?... or maybe 32 as more compatible?

Does anybody know if I still have to use the connecting dongle(s) to 
support Crossfire in a 5770 setup? thanks