I was reading up on the internet and i saw that my Q6600 is pretty easy to OC from 2.4ghz to 3.0ghz.
So i changed to FSB 333 and Multiplier to 6 (333x6) but then when i did that, my pc just didnt even wanted to boot anymore or go into the bios screen.
After a few resets i got a screen that the 'Overclocking had failed' and it automaticly changed back to 2.4ghz.
This link provides a little information on overclocking with a similar motherboard. The trick to memory settings is that different motherboard BIOS use different terms to achieve the same thing. From this link it appears that the right setting for MSI is simply 1:1.
If your CPU is running at 3.0 GHz then your main bus is running at 333MHZ and your ram (because it is DDR, "double" data rate) is running at 667MHz. You can do the math for faster speeds- there is a small chance that your CPU would run at 3.6GHz, in which case your ram would be running at its full rated speed of 800MHz.
If you google "msi q6600 overclock" you can probably find other people with the same motherboard and cpu that you have and see what their settings were.