I bought a 2nd 660 Ti for SLI a while back and while it does give me a nice boost in previous gen games (PS3/360/PC versions) it feels like a waste of money of late seeing how a lot of newer games (PS4/X1/PC versions) of late have poor SLI performance. I'll probably ditch them for a single GTX 970 and upgrade to whatever GPU is out at the time when I feel the need to upgrade again in the future and spend the extra cash rather than SLI the 970.
The games off the top of my head that have poor SLI performance that have been released recently are Wolfenstein, Watch Dogs, Metro Redux and Dead Rising 3. Makes me worried for future PC versions so I'll just go GTX 970.
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