If the price diff between the 965 and the fx4300 is large enough(20-30 bucks) then it may make more sense to get the 965. Its only a little bit slower than the FX and still is a good CPU. I'm using an x4 970 myself paired with a 6970 and everything runs smooth not many bottlenecks really.
The Fx is only like 5% faster and isnt even a real quad core like the 965.
If you have the 965 I would not recommend upgrading to the FX-4xxx series. Its not enough of an upgrade to warrant the price, when the FX6/8xxx is closer in price.
Yeah I agree the FXs are better, but I havent seen a 965 for sale in a system, or standalone in a few months now. So I figured he had one.
EDIT: nevermind.
If the price diff between the 965 and the fx4300 is large enough(20-30 bucks) then it may make more sense to get the 965. Its only a little bit slower than the FX and still is a good CPU. I'm using an x4 970 myself paired with a 6970 and everything runs smooth not many bottlenecks really.
The Fx is only like 5% faster and isnt even a real quad core like the 965.