On most games yes the 780ti SLI will be best. Not exactly sure where you got 47% from but 290x crossfire does better than that in all the games tested in reviews I've read. However you might start to run into vram limits if you are gaming on multiple screens or uber-ultra resolution (also future gaming), this is where the 4GB of the 290x will come in handy. Also the 780ti's overclock like beasts so they should have a comfortable lead over the 290x that doesn't overclock as nicely. This has comparisons with some of the top performing custom cooled cards (780ti, 290x), check other pages for other info. http://hexus.net/tech/reviews/graphics/64705-gigabyte-radeon-r9-290x-windforce-oc/?page=11 The other 290x to compare is the gigabyte WF OC as it performs better than the sapphire (at factory oc that is). If it were my money I would get a 780ti from MSI (the one reviewed here), or if I planned on gaming on multiple screens or at some crazy resolutions then I would probably get a Gigabyte 290x windforce OC.