Forgot to say:
The designer of DFI LP UT NF3 250GB, Oskar Wu,
he used to beta test the board before it was released by using this Gskill RAM and cracking the speed up to DDR700 or more!
It's based on Samsung's Tccd IC:
All you can see are 512mb modules
As the configuration on the sticker they mark,
I and my friend have done all the tests exceed the limit already.
Please see all the tests below:
RAM : 512 modules:
All the tests:
of course, how about 256mb modules?
here you go: