Hi, I've searched google all over, tried various things but nothing seems to change it Using Win7 x64, PC Spec: Intel i7 920 Asus Rampage Genisis 2 I have 3 x 2GB Corsair, (6GB) installed in slot A1, B1 and C1. Windows only seems to pick up on 4GB however I do have 6GB installed. I ran CPU-Z to scan my system and it picked up all 3 sticks, they're just not being used for some reason. Any help greatly appreciated, I have moved the sticks around, reseated them and my CPU (no bent pins) so i'm pretty confident it is either a win7 64 bit issue, maybe a setting somewhere or BIOS settings. Note that I do not have Memory Remapping in my BIOS, is there an alternative?