Are you ready for some PC SPECS?! Can I get a HELL YEAH?! Well, here we go then! The PC specs for Call of Duty: Black Ops 2! Well, the minimum specs, anyway, and a subsequent Q&A.
Seems that at the least you’re going to need Windows Vista, since they’ve upgraded to DirectX 11, and Windows XP is no longer supported. There will be enhanced graphics for the PC, including lighting, shadows, antialiasing and all the mod cons, so if you want to take advantage of all of these exciting visual features, you’re probably going to want to have more than their minimum specs (an Nvidia GeForce 8800GT 512 MB or ATI Radeon HD 3870 512 MB).
It is specifically mentioned that the game will be playable on the minimum specs — for reals, no foolin’. They’ve tested on a bunch of different hardware, and are confident that the game will be playable if you meet the minimum requirements. For more details check out the full specs and the rest of the Q&A over at the official site.
Source: Call of Duty Community (Thanks, PalZer0)