dual graphics cards or just getting a new one?

[Psyche]

I am going to be in possession of some new CASH, I already have a computer with a 650 Ti graphics card, should I used the money to get the same card and use SLI, or should I get a better card like the 660 or 670?

[Dirk]

Absolutely SLi that card (unless you would need a new PSU to do so). GeForce GTX 650 Ti vs Geforce GTX 670 ? Performance Comparison Benchmarks @ Hardware Compare As you can see in that comparison a GTX 670 is not going to be noticably faster than SLi GTX 650 ti but buying another 650 is MUCH cheaper than buying a 670 from scratch(even if you sell the 1st 650). Seeing as you would not be gaining any features the 670 would seem a waste. The other option would be to hold out for the GTX 700 series cards and see how those stack up.

 

edit: I should note that if you plan on playing games at extremely high resolutions well above 1920x1080, the 660 Ti or 670 might make sense as they have more vram (unless you have the 2GB version of the 650 Ti) and significantly faster vram. This is only important once you start running extremely high resolution.