UNIT : DELL OPTIPLEX 380
Motherboard : 0HN7XN
CPU : INTEL CORE 2 DUO E8400
WINDOWS 7 64-BIT
OLD RAM : 2GB DDR3 1066MHZ CL-7 NON-ECC, UNBUFFERED 1.5V
NEW RAM : 2*4GB PC3-12800 CL-11 NON-ECC, UNBUFFERED 1.35V
I want to upgrade my unit's RAM into 8GB from 2GB. But when I insert the new rams...