Ok first of all, your RAM's stock voltage is 1.8V, so that means remove that "+.2V" in the BIOS. That's making them run at 2.0V, which could cause some instability in its own right. Don't try to overclock the RAM and CPU at the same time, start off with the CPU, get it where you want it, and then try tightening down the RAM timings as much as you can while keeping your stability. So that means you did good by loosening the timings to 5-5-5-18, but that extra voltage can go take a hike.
Now for the Q6600: I had the same chip on the same mobo, and got to 3.4GHz 100% stable with 1.45Vcore in the BIOS, though I did have a chip with the highest possible VID (The stock voltage Intel programs into each cheap depending on how well the chip can clock. A higher VID is bad because that means it takes more voltage just to be stable at its STOCK speed of 2.4GHz) of 1.325V
I'd say go straight for 3.4GHz by setting your FSB to 378MHz and your multiplier to 9x with 1.45Vcore and either +.1 or +.2 on the FSB voltage. Put that in and tell us how it goes after some stress testing.
P.S. Make sure your PCI-E frequency is manually set to 100MHz, not auto. With auto on, it increases as your FSB does, and any PCI-E frequency over 100MHz can damage your video card.
To change your RAM frequency, look for something that says RAM:core clock ratio or something along those lines, and decrease it to the smallest number it will go to. (It won't be in 4:5 or 1:2 format, it will be if you divided those numbers, so 0.8 or 0.5 - Note that those two numbers are just for example, I don't think they are ones you can even select)
Edited by The_0ctogon - 12/24/08 at 9:49am