Need some help

[IceAoA]

ok I just put in a new motherboard to upgrade my old e-machine the new mobo is a p4m900-m4 i'm reading in the manual here and on their site that it can take 4 gb of ram when i installed the ram and cranked it up it only reading 2.43 gb can anyone help?

 

[kimsland]

Xp 32 Bit can't read 4Gig only 3 (and less if video mem being used too)

Xp 64Bit
and Vista will read 4Gig ok

So it's not just the motherboard maximum specs, it's also the OS