Hey everyone, recently I purchased another 8Gb of Kingston HyperX RAM and installed it into my computer which already had 4Gb. However, Windows 7 Pro 64-bit says 12Gb installed (6Gb usable). I think it is an issue with my motherboard but I'm not too proficient with this so I'd like to seek some advice and whether this can be overcome. My system specs are as follows: Intel i7 870 @ 2.93 GHz Asus P7P55D-E Asus ATI 6870 Kingston HyperX CL7 4Gb Kit (Originally purchased) Kingston HyperX CL9 8Gb Kit (Purchased today, the shop assistant told me that they no longer bring in the CL7 due to it being too costly. They told me my CL7 would function as a CL9 once I put my new kit in) As mentioned before, I'm running Windows 7 Professional 64-bit version. Thank you very much for your help!