Your system should be able to handle black ops at 1920x1080. I also got a big performance boost when I updated my drivers to the latest release version (non version number) 260.99 . I don't know what operating system you use so go here: http://www.evga.com/support/drivers/
NVIDIA GTX 200 series only:
If you use Win7 x64 then here is the direct link:
http://us.download.nvidia.com/Window...glish_whql.exe
If nothing else I recommend you defragment your game's cache files through steam.