4Gb's ram, showing up as 3.12Gb's in Windows XP??

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yes i have the same MB p5ld2 but i have 8 gigs of ram installed with a 32 bit os but it finds 5 gigs of the ram and thare is and neerly 2 gigs of ram is use 4 windows and outher stuff to help make it run i have over 3 gigs of ram that i can use i am going to get and install 64 bit os im runing 32 bit vista home p i have a plen d dual core prosseser 3.6ghz oc to 4ghz so its windows and outher programs installed to windows that use your ram i recenly just up graded the video card a nivida g force 8800 with half of a gig of ram and it runs beautifuly once i upgrade to 64 bit os ill update my post and tell you more and see what happens with the ram