i think u miss understood when i said 64 bit..quote from apple .com "The new Power Mac G5 can offer up to 8GB of RAM thanks to the ((**64-bit**)) G5.. i wasnt talkin about the bus..the ram doublea pc but for my need i wouldnt need 8..better alone 4..most programs today dont require much use of 4-8gigs of memory..still nice to have