you guys are wrong it goes by systems capacity if i bought a motherboard that supports 8 gigs it will show 8 gigs maybe some will not show to dead sectors on the chip but right around 8 gigs will show xp's service pack 2 and greater changed the memory table limit especially for rack mount boards for business use. most motherboards in the 2000-2005 didnt support more then 4 gigs as they stated 3.5 was what it would read but due to gamming growth with wow and crysis and other high powered games the systems have changed 10 fold