Here is the deal. The board I am using (ASUS P5KPL-AM IN/ROEM/SI) has only DDR2-667 (3:5) and DDR2-800 (1:2) options. For the CPU I am using (E5500) the optimal FSBRAM ratio would be 1:1 (DDR2-400). The link to the BIOS (direct) : techspot.com/drivers/driver/file/download/14186/ Thank`s in advance...