Win 7 Ultimate x64 Bit ! - Doe's someone use it ?

[durrrrr]

64bit isn't using 4gig of ur mem, its using like 1 gig maybe and the diff between em is that with 32bit u can only use 4gig n with 64bit u can use as much as u want

No, with 32bit you can use ~3.2 GB, and with 64bit as much as you want (or can, at the moment).