need help with overclock on 939 board

ive got a asus sli se motherboard. 2gb corsair xms cmx 3200pro memory timing is 2.5 5 3 5 running at 400mhz 2.8 volts. 1010ocz power supply. amd 4400 toledo core socket 939 ive been playing with the setting cant get past 2509 on overclock if any body has any ideas it would be great im trying to get it to 2600 ive tried seting the htt to 4 times the fsb was at something like 940 ive put it back to 5x the fsb is 1140.5 it didnt make any differance i had to lossen timing to get it to 2509 i can go to 2530 but not stable it freezes up in 3d mark 06 my score is 9076 3d mark o5 is 6648 these scores are with 2509 overclock the cpu score in 3d mark 06 is 1810