ok heres an update
got 2 sticks (lets call them pack 1) working fine, op system working and stable so i put pack to in aswell, and first boot up, it bluescreened.
ran memtest on it and litterly dozens of errors, didnt stop to count but probably close to 100 if not more.
so took back 2 back out and ran memtest on pack one. no errors, ans system stable again
so i thought remove pack 1 and put pack 2 in on its own (in the correct place for just 2 sticks of course)
and the result... bios wouldnt even get past its own pre tests.
seems pretty obvious to me that pack 2 is faulty, so i am going to have to take it back to overclockers and see what happens
and body disagrea?