8GB Ram, only 3.99GB usable

mdn7

Prominent
Jul 14, 2017
2
0
510
Hello,
After installing a new graphics card i have only 3.99GB ram usable of 8GB, i have 2x4GB.
I tried msconfig,Windows Memory Diagnostic,reseating ram, and a new system. I have Windows 7 64x SP1.
PC Specs :
i5 760 2.8GHz
8GB Ram [3.99gb usable :( ]
GTX660 2GB GDDR5
I need help cuz i wan't to sell it, fast please.
And sorry for bad English. Bye!