Originally Posted by
synaesthesia
Exactly it, regardless of what other peripherals are in the system, 3.2 is a normal maximum.
Vista x64 is hardly any hassle, it's very well supported and the only things really holding it back are some software support from older hardware manufacturers. In most cases it's perfectly fine and will certainly make the most of better hardware, unlike XP (open to debate).
So, unless you're happy to put up with it, feel free to post the components you're worried about x64 compatibility and I'm sure there are folks here with some form of experience that may put your mind at rest.