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so the performance of the 680 was worth the price for an upgrade?

Flip a coin or go for whichever is cheaper. they perform identically.

Flip a coin or go for whichever is cheaper. they perform identically.
Flip a coin or go for whichever is cheaper. they perform identically.
I personally wouldn't spend any money going SLI/crossfire with a 1GB set up nowadays. A chance all the GPU power is wasted (not able to turn settings up) due to VRAM.