hehe sorry i wasnt clear, the normal SPDs both are exactly the same, i checked, rated at 1.8V to run at 5-5-5-18 @ 800Mhz (2T), its just the crucial have an EPP profile that is rated 2.2V to run at 5-5-5-15 2T @ 1066Mhz....and my mobo cant see the EPP so for all it knows theyre identical sticks (just the quantity per stick thats different)