Bottleneck / Gtx 950

Solution
It will bottleneck it just as much, and as little as any other video card, because they basically have nothing to do with one another. Your video card determines what graphical settings you can get, while your CPU caps your maximum framerate.

EDIT: That said, FX-6300 is a weak CPU by today's standards but it's not awful. There are some games that will run poorly, but the vast majority should run alright. I rarely recommend it (it's 4 years old now!), but there are circumstances where it can make sense.
It will bottleneck it just as much, and as little as any other video card, because they basically have nothing to do with one another. Your video card determines what graphical settings you can get, while your CPU caps your maximum framerate.

EDIT: That said, FX-6300 is a weak CPU by today's standards but it's not awful. There are some games that will run poorly, but the vast majority should run alright. I rarely recommend it (it's 4 years old now!), but there are circumstances where it can make sense.
 
Solution
Wait! The Pentium G860 is on Intel's socket 1155, which has vastly superior CPUs to the FX-6300. You can buy an i5 25xx or 35xx on the used market for close to the same price as the FX, and it will crush it in just about everything. AMD's socket AM3+ is actually a downgrade from Intel's socket 1155.