Thanks for your input Charvel. My i7 is a C0 stepping CPU however and not the more overclockable D0 revision. Had i bought it a mere couple of weeks later it would probably have been a D0 chip, it's the one time i went out and bought a high end CPU early in its life cycle (had this PC for almost 2 years) and it's biting me in the behind
In any case, i've read some articles and they say it's possible even for C0 CPUs to reach 3.3-3.6 Ghz and anything higher than that is too much watts for the amount of extra power gained (i keep the PC running almost 24/7 so power consumption is an issue to me), so i might try it if i see it's giving me trouble.
Now that i think of it, all of that will also depend on how well CoD will utilise the extra cores and/or hyperthreading. Maybe we can get around a lower clock speed due to the extra cores/threads, who knows.
I'm very surprised that you say my GPU will actually fare better than the rest of the system, but then again the game is DX9/DX10 and the 4890 was one of the last DX10 series cards, so it makes sense somewhat.
Anyway, thanks for the input everyone, it's wait and see from now on