YES, Absolutely.
I had an Athlon II X4 640 paired with an old 9800gt. I decided to upgrade my hardware in order to play GW2, because I wasn't happy with the performance I was getting.
After much deliberation I concluded the graphics weren't too taxing on my 9800gt, my performance woes came form the cpu side. This was confirmed after seeing the huge performance gains after they applied the CPU optimizations to the game.
I finally decided to buy a core i3 2120. Mr, there was a day-night difference. Not only in GW2, where my fps went from 12-18fps to 20-35 fps in WvW. But also in gw1, Oblivion, Batman Arkaham city, Skyrim and the biggest gainer; WINE.
If my cpu was bottlenecking such an old card as a 9800gt by that extent, I can only imagine how much more restrained a 550ti will be.
Intel has such a superior architecture, that a dual core "budget" cpu trades blows, and in most cases comes ahead, with the very best AMD has to offer. Don't believe me, believe the benchmarks on this very own site:
http://www.tomshardware.com/reviews/gaming-fx-pentium-apu-benchmark,3120.html
If you plan on gaming, go intel, you won't regret it.
Signs: A very sad AMD enthusiast.