You can use E8400 at 3GHz (9*333) without any issues.
(However: EIST willn't work on 45nm CPU, so processor will be every time at 3GHz, without energy savings,
and you can't choose 800MHz for memory, only 834 and 667MHz).
I wanted get an advice for you, that if you spend 2 minutes, enter BIOS, you can overclock your E6600 to the same 3GHz, because E6600 and E8400 have the same "9" multiplier. Set bus to 333MHz, as if you buy E8400, and all. It's not an extreme overclocking, it's very very safe.
And what you print about memory? At 333MHz FSB you have to choose your memory speed between two choises: 834 and 667MHz. So this small issue will be not only with E6600 at overclock, but and with E8400 at nominal.
However for performance it's nicer to set processor to 3.2GHz (400*8) (or 3.6GHz, but it can be done with huge voltage increase and you, I think, not wanted to do it), at 400(1600)FSB processor bus will be as fast as dual channel DDR2-800 memory. At 400FSB you can set memory to 800 or 600MHz.
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