8GB Total memory using 2pc of 4GB 1333MHz
Module 240pin dimm DDR3 10600.
Lifetime warranty for exchange. by Computer Memory Solutions
Brand Computer Memory Solutions
We don't
use Generic modules to avoid incompatibility issues.
Guaranteed
to work or you get all of your money back including shipping.
Features
Compatible with Dell Optiplex 390
Notes: In order for the computer to read the maximum amount of memory a 64bit operating system is require. A 32bit operating system will make the computer to recognize only 3 or 3.5gb depending on system memory and resources.