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#11
The points been missed - it's a Pentium D CPU 3.40GHz and 8500 GT. OC'ing either will net very little (ie SFA) real world gain for potentially a lot of effort. Assuming that the mobo has the needed OC options unlocked to begin with.
I played COD MW2 with similar specs years ago and I was lucky to get above 20FPS on low/med @ 1024x768. While Black OPS isn't much more demanding than MW2, it's still going to run terribly.
Best of luck with whichever way you go.