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if you go into the black ops folder inside steam, go to the players folder and there are two important files, config.cfg and config_mp.cfg edit both in notepad. search for the following strings seta r_multiGpu "1" seta r_multithreaded_device "0" by default, its set to enable multigpu mode and disable multicore support. set the value of multigpu to 0 if youre not running crossfire/sli. set the value of multithreaded to 1 to enable multicore support. so it should look like this. seta r_multiGpu "0" seta r_multithreaded_device "1"