DDR3 1333 kits are generally timed 7-7-7-21 while DDR3 1600 average is 9-9-9-24. Some DDR3 1600 can be as low as cas 6 and the kit I have is timed 7-8-7-24. 8-8-8-20 at 1440 is average. How did you get an oddball speed like that? There is really very little benefit from overclocking RAM. If you have a DDR3 1333 kit you will see no difference running it at 1440.