We see many, many problems with the FX 9xxx series chips and motherboards that officially support them. Truly one of the worst CPU series ever made.
A stock i5 beats one in pretty much everything. A stock i3 beats one in almost all gaming benchmarks.
If you are staying with AMD them Martell1977 is right on. Get an FX 8350 or 8370 and overclock it. You will still need a good motherboard and cooling but you are less likely to have problems.