Yep. You should be fine if you keep your CPU temps under 80'C at full load when running Prime95.
Your idle temps are very good as well. Try going for 3.8GHz-4.0GHz.
Then again, you don't really need to OC anymore since most games have a "sweet spot" of 3.0GHz-3.6GHz for the i7/i5 quads where any OC beyond that yields continually smaller improvements in gaming fps and benchmarks.
There are benchmarks out there that show that even a stock i7 860 won't bottleneck two 5850s or even two 5870s by very much, and an OC to 3.6GHz would mean you'll have little/no bottlenecks in terms of CPU power.