3,00 Ram Usable I Have 6 GB in RAM and only 3,00 USABle..... I have the 64bits win7 Ultimate edition. The board is Intel 945GNT With 4 Slot, distribution: A = 2GB 800 MHZ B = 2GB 800 MHZ, C = 1GB 533 MHZ and D = 1gb 667 MHZ. In the Bios All Is OK, i cant see changes to do..., Whats the problem?