Loong Neet :
Best Graphics Card for AMD FX6100 Processor.... I'll plan buy MSI GeForce GTX760 GAMING Is ok?? ....or other Graphics Card???
It's not too late to change the CPU is it? That will really, really, bottleneck anything you throw at it. It will devastate any even slightly CPU-bound game. See what happens when an FX-6100 with HD 6950's in crossfire (more powerful than a HD 7970) takes on an I5-2500K with 2 gtx 460's in crossfire (about on the same level as a HD 7870):
If there's any strain on the CPU at all, the FX-4100 will bring your frame rates crashing down. Only in games (like metro) where the vast majority of the strain is on the graphics cards will you be even slightly OK.
Switch to an intel I3 or I5 if you've got the budget. Even if you're sticking with an AMD motherboard, then I cannot under-recommend upgrading to an FX-6300 as soon as possible, and then you'll still want to overclock.
However, if you're still stuck with this CPU, then you should probably go no higher than a HD 7850/GTX 650 ti boost to avoid bottlenecking. Maybe a HD 7870/GTX 660 if you can get a decent after-market cooler and overclock. If you get an FX 6300 and overclock, then you could probably go up to a HD 7950/GTX 760, but no more.