I am running a 64bit os so it will clearly benefit me.
The 4gb stick is a Kingston Fury White Series
1600 mhz, ddr3, 240pin (obvs)
and i was thinking about adding a
8gb stick Kingston Fury Black Series
1600mhz, ddr3, 240pin
I got all i could but i couldn't find the model n#.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic