hie , im using the 8i945P-G mobo and just recieved 4 (!:)) G.skill pc2-6400 1024 sticks ... wich is good so far. thwn i installed the first 3 the bios identifies them correctly and shows :eek: 3072MB of ram when i add the forth stick it increases the ram to 3400 ... i'v tried to change places of the sticks, use diferent combination and even tried it with a 3*1024 +1*512 ... still the bios says that i got 3400. the funny thing is that windows (xp64) shows 3250MB YET CPUz shows all the 4G correctly :) i'v updated the bios to it's latest (F11) version and still nothing :( *** i know that the Mobo supports ram up to 667Mhz and those are 800Mhz sticks *** but it suppose only to alow them down (and its realy good 4 OC coz the *** Mem runs @ it's natural speed when i'm using 250 FSB (3000@3700 Mhz) [COLOR="Red"][B][SIZE="5"]any idea what may cause this messup ???[/SIZE][/B][/COLOR]