Hey guys i upgraded a 4 more gb ram and now its 8 gb , ok everything works fine with all games , so again i went to computer properties it says 8 gb ( usable 3.93 gb ) i didnt recognize this one , but how come ? Why its just 3.93 gb ram usable , by the way i didnt upgraded my bios , i dont if this is the problem , hope you guys help thank you