Q: I'm using Intel FSB 400 MHz CPU, why does my DDR 333 SDRAM only run DDR 266 on P4i45GV?(2003/10/15) A: According to the Intel's specification, if you're running FSB 400 MHz CPU on P4i45GV, DDR SDRAM only supports 200/266. If you're running FSB 533 MHz CPU, DDR SDRAM supports 266/333.