The FX 8350 right?
No, it's not worth it, the FX 8350 is an AMD processor using 32nm transistors, which are partly responsible for the chip being hot and unstable. And don't be thrown by the clock speed and core count - it's really not that great of a CPU. If you're looking into an i5 upgrade, then you should consider it. But I do think you should replace that CPU, since it's pretty old.