Memory question/ CPU question

[corup7ion]

I'm using the 32 bit Vista home premium. I have 4 gigs of DDR2 800MHZ RAM. Since 32 bit can only use 3, i feel like im wasting one. Or does it actually use it and not say? if i upgrade to 64 bit, will i see a huge increase in performance? I havent gotten past 30% memory yet

Secondly, is there an easy way to just simply upgrade from 32 bit to 64 bit? or do i have to wipe clean and start over? And im just wondering if all my drivers will work...

AMD 6000+, Geforce 8800GTS 640 MB

CPU Question.

I read somewhere that you need a BIOS update for vista to recognize the AMD processor.. my computer reads it as like.. ???processor??? or something..

Where is the link to this bios update? I cannot find it.... and.. do you think this is actually decreasing my performance?

 

[ambientZ]

It doesnt use it. The video card and other devices need the address space, so windows has no way to access the ram that also is in that address space.

Its far more useful to be able to access your video card, than the extra ram

And until you start running out of memory, you wont notice any difference with being able to access 4gb.