I have a system with an XFX 5770, Athlon II x4 640 @ 3.00GHz. I have about $280 to spend on upgrades, $60 going towards a 630 watt psu. So with $220, would it be most cost effective to crossfire my 5770 with another 6770, or ditch them and get a 560 Ti? The 6770 would be much cheaper, but I'm not sure about the performance.
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a single 560ti is better option.get xfx 550w psu.it's enough for single card setup.invest more in gpu.