Alright so my buddy has a Nvidia GeForce GTX 550 Ti and he wants to upgrade his GPU to something better. I Suggested he get the GPU I have which is a Gigabyte Radeon HD 7870 GHz Edition which is around $253 at newegg right now but a few days ago I found this other card for another friend who wants to build a PC for around $700. The card is the EVGA GeForce GTX 650 Ti Boost Superclock Edition which is only $154 on newegg and is only 16% less powerful than the 7870 but still can run everything on Maxed settings. So when I was talking to him about it I thought to myself well he could just get another 550 Ti and run it on SLI it might be cheaper and more powerful then the 7870 or the 650Ti the thing is I can't find any place where you can compare cards at SLI with cards that aren't so what do you guys think would be better?