New RAM compatibility to increase capacity

[alto]

Hello,
I have existing 2GB RAM 1333 MHz(normal Corsair), now want to increase capacity. 2x2GB module 1333MHz. Would be compatible?
Existing System: AMD Phenom II X4 955 Black Edition 3.2 GHz
Mobo: Gigabyte 880GM Usb3

Thanks in advance.... If any query then tell me....

 

[vivek.krishnan]

Get another module, same as that you are using, with same specs, its the best for your machine.