Hmmm , sa ram slot ok naman since nababasa nman na 8gb talaga (4gbx2).Check mo mga ram mo its either sira yung isang slot ng RAM or sira yung isang RAM mismo.
as for bakit hindi buo yung makukuhamo mung RAM capacity ay yung nakaltas na RAM capacity was reserved for your GPU![]()

so kailangan pa po mag format?Naka experience ako ng ganyan boss, ginawa ko na lahat option. Advance option. Isa lang gumana sakin. Before mag install ng os, delete partation into one, and format, and shrink it into 2. Before install. Nag 8 gb na ram ko.
tama itong sabi ni hannebalism please gawin mo ito tsGo to msconfig > boot > advanced options > uncheck maximum memory