Well, I found that 8GB of this ram is stable at 1000MHz 5-5-5-15 and 2.1V with 200 iterations of Linpac. As Cronos mentioned, this is a uber stability test. It makes my quad hit 74C on water (prime 95 never gets more than 60C).
However, to do so, I had to lower my multi on my QX6700 down to 9 from 10. With an FSB of 1400 I'm taking a hit down to 3.15 ghz whereas before with 4G and a 680i board I ran stable at 3.5 GHz.
I haven't figured out why yet but is it normal that with 8G you would have to lower the cpu speed? I would have thought that I would have had to lower the ram speed.
The problem is, if I raise the FSB much mnore then memory perfomance really takes a dive.