8GB (2x4gb) of DDR3 used pc memory. Installed in my PC back in March 2014. They look diff bc I first got the kit (2x2gb)and then when i went back they were sold out of the kit so i got 2 single sticks in separate packages so the # are diff on each set.
They are both DDR3 1600 speed 9cl @ 1.65v hyperx blu. The guys at Tiger Direct told me they were the same thing but just look diff.
I took photos of the sticker on them so you can google for the specs sry!