Dell 755 Optiplex Windows 7 64 bit not recognizing all loaded RAM.

shanepc

Honorable
Nov 5, 2013
2
0
10,510
I have a Dell 755 Optiplex Dual-core that I upgraded to Windows 7 64 bit. The machine is capable of having 8GB of Ram. I installed 8GB (all of same type recommended by Dell) but machine only recognizes 4GB. Any help?