Is it worth upgrading from AMD FX

I assume you mean for gaming (guessing by the GPU) and the answer is you will get some benefit but not any thing that comes close to justifying the price.

For now it really wouldn't make sense, because although an Ivy Bridge i5 would give some FPS difference, it wouldn't be big enough to justify a new motherboard/CPU/time spent redoing it all.

Maybe in the long-run it would be, although if that's why I would just stick with your current CPU until Haswell comes out.

Wait till Haswell or Steamroller. Upgrading now is absurd. The difference isn't worth the price you'll pay.

I recently upgraded form a Phenom X6 @ 3.4 Ghz, (which probably performed similarly to an 8120 @ 4Ghz in games) to a 2600k @ 4Ghz....

Not worth the money to upgrade.

It's nice to have an i7 and pretty bench mark numbers, but my games basically play the same (two GTX 560's SLI) as they did before.

The i7 is better and arguably even worth the added expense when buying new, but not worth ditching a good AMD rig and spending more money on top of the AMD money already spent.

Thanks for the quick reply's guy's i guess i'll just wait out the next generation

The generations out aren't that much better at the moment. I have the 1100t 6x it's not all that great and the FX8 doesn't really perform all that better either. I would wait until the next generations as well.

Well if you're able to get a good price and sell your current machine you would get rather tangible benefits moving to a Core i5 under most games. All that is required on your part is effort. If you feel the effort is worth the benefits (which are rather large in gaming) then do it.