Dualcore I have 4 GB of Ballistix 1600Mhz at 8-8-8-24

Since I'm running 4 sticks, it's a big push for the chipset, so I'm running them stable at 1333Mhz 9-9-9-24. I can say they are very stable problem free, I'm happy. But I wouldn't adventure to push them more, unless I'm running only 2 gigs. :-)

I'm currently overclocking my Q6600 @ 3.01Ghz with 1.275VCORE.

Machine is 100% stable.