Just wondering how you came up with those as your two choices for your gpu/'s. Two 7950's costs around $700 while one 670 costs <$400. Obviously two 7950's are going to give better performance than one 670, but it is probably not worth it. If you are gaming at 1080p, then one 670 will be more than enough for the next year so and you'll be able to max out just about any game. If you are gaming at any higher resolution or more than one monitor, then I'd recommend a 7970 which is usually around the same price as a 670.