Low FPS. Are my specs bad?

[StupidStories]

Sites with cooler reviews:

FrostyTech (very good)

X-bit Labs
Hardware Secrets
Hard OCP

Make sure it fits the AM2 socket.

The overclock is limited by your CPU (every CPU is different in this regard), your motherboard and your cooler. Overclocking is done by trial and error. You'll find many guides on the internet.