Hi , guys please help me !

I bought a new components ;

1- Gigabyte ds3P rev 3.3
2- E6420
3- 2x1gb geil ddr 800 ultra series

Everything is fine till 8x400 = 3200 mhz default vcore and 4-4-4-12 ,2T 2.1 v dimm .... but I can't go higher .. I'm using latest bios of DS3P>> F5 .. Can you give me a little tricks of this boards .. My target is 3400 ~ 3500 mhz .. please help ..


Thanks a lot .