Memory Timings below stock

[SpriteAlpha]

I have 4GB (2x2Gb) of OCZ DDR2 PC2-6400 Platinum rated at 5-4-4-15. However, no matter what speed I run the memory at, I can't get below 5-5-5-15

Any ideas?

I'm running this memory on an Abit IP35 Pro with a Q6600

 

[Vir]

Maybe it's still on 1.8v and it needs more? You could check

 

[SpriteAlpha]

I've got it on to 2.1V. I've also put it up to the rated EVP 2.2V, but that didn't help a thing.
Thanks anyway

Edit:

Ah. I've just been told that changing my MCH voltage might work. I'm gonna try that