GTX 550 Ti OC or GT 650M SLI?

Are you trying to compare desktop laptop options? They're apples and oranges, because laptop GPUs are much slower than desktop GPUs beating the same model number (without the M)

A desktop GTX 550 Ti is just slightly slower than the laptop GT 650M SLI combo, which ranks #46 overall among laptop graphics cards. A desktop GTX 550 Ti performs about identically to a laptop GTX 670M.

http://www.notebookcheck.net/Mobile-Graphics-Cards...

http://www.notebookcheck.net/NVIDIA-GeForce-GT-650...

For a desktop, the Radeon HD 7770 or GTX 650 Ti are much more appealing choices than a GTX 550 Ti (being OC only boosts performance about 5-10 percent)

http://www.techpowerup.com/reviews/Zotac/GeForce_G...

GTX 550 ti is a desktop gpu and GT 650m is a notebook gpu...idk what u mean...but i say GTX 550 ti is better than GT 650m Sli'd...

If you are going to buy a gpu for your PC,i would say get a GTX 650,or 650 ti...

For a laptop,i would recomment GT 650M sli'd.

One is for notebook and one for desktop so the question is rendered irrelevant