May not really be worth the extra cost. The R7-260X is basically a re-badged HD 7790. But if you game at 1080p, it may make the difference between using low settings and medium settings... and do it quieter.http://gpuboss.com/gpus/Radeon-R7-260X-vs-Radeon-HD-7750
But avoid trying to do CF with low end cards like the HD 7750. They don't scale well enough and are more prone to micro-stutter. I tried it with a pair of HD 7750s myself. Not good.