this faster 6gb kit
http://www.overclockers.co.uk/showproduct.php?prodid=MY-279-CS&groupid=701&catid=8&subcat=1392
or this slightly slower 12gb kit
http://www.overclockers.co.uk/showproduct.php?prodid=MY-294-CS&groupid=701&catid=8&subcat=1389
and why?
http://www.overclockers.co.uk/showproduct.php?prodid=MY-279-CS&groupid=701&catid=8&subcat=1392
or this slightly slower 12gb kit
http://www.overclockers.co.uk/showproduct.php?prodid=MY-294-CS&groupid=701&catid=8&subcat=1389
and why?