We had a chance to play with OCZ DDR2 PC2-6400 CL 3 FlexXLC Edition 2x1 GB memory. As it says at the box it works well at EPP 3-4-4-15 settings, 2T command mode.
We use EVGA Nforce 680i the best memory overclocker board around. As this was not enough for us we tried to set the memory at 1066 to synchronise it with the CPU's front side bus.
With air cooling we were shocked to learn that the memory worked at 4-4-4-15 at 1066 MHz. it can hardly get better than that and this is among the best timings available at this speed.
We will write a massive review soon but we just wanted to share this great score with you. This flex is really super flexible.