Well, I guess I'd need to try with those timings then, I did try the 5-5-5-12 at 1000mhz but no luck, I didn't try anything below that, so the only two I tried were 442 and then I tried the full 500mhz and no luck but I guess maybe mine could do the 490 as well.
Wish I had an E6300 to test them on a 1:1, I don't really like to change the ratio on my E6600.
I will try a 245mhz with a 1:2 ratio on my P5WD2-Premium and see if that is stable, and it should be DDR2 900 speeds with that ratio. I'll do some time. I'm not trying 5-5-5- though, I'll try a 5-4-4-9 and see what happens.