IIANM, intel chipset i855 mobo support up to DDR333 (PC2700), so if u use a higher clock DDR ram (DDR400 aka PC3200), it will downclock the ram to 333Mhz, so technically u still can use it (DDR400) but with lower clock

This post has been edited by skylineGTR: Sep 20 2008, 02:12 AM