Should I go with a 2 GPU SLI or 1 single better GPU

Dimbata23

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Apr 8, 2015
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So I right now I have a GT 640 gpu and MKX is not running smoothly at all.
(Stuttering every 5 frames or so.)
My question is should I get another GT 640, or should I just buy a GTX 750Ti

P.S. The CPU is good enough (for now).

P.S. I have a 1920x1080 60Hz monitor