This is probably the first OC3D review I'm really saddened by.
XMS man, please if you have time retest these! GKX's should do 600MHz so easy!
Please make sure you were at
Twr - 6
Trrd - 5
Twtr - 3
The RAM should have done 600MHz 5-5-5-5-15 @ 2.5v.
At 1000MHz they should do
CAS - 4
TRCD - 4
TRP - 4
TRAS - 7 (Or Lower, try 6, 5 & 4.)
TRC - 12
TWR - 6
TRRD - 5
TWTR - 3
With 2.2-2.35v.
If the BIOS doesn't have the proper RAM settings available, you can get Memset.
Oh, and test with active cooling (of some sort). D9 pumps out a lot better results with a breeze.
GL man.