Your CPU is below minimum requirements.
It's in the same generation as the one of the minimum requirements (9800) so there's an option it will boot seeing how the cpu infrastructure will be similar.
But if it runs at all it'll be slow at minimum settings.
Probably you'd get about the same FPS as with the 630 and the Phenom 9650. I would recommend getting a new GPU if you're seriously looking to play this game at a stable framerate without having to lose graphical fidelity.
The X4 9650 isn't the problem. The bottleneck here, i.e what would make the framerate rubbish and visuals look crappy, is the graphics card. You need to replace the 630 with at least something higher then a 650 to get near console level performance.
Phenom 9850 is listed as the minimum AMD processor, FX-8350 as recommended. Probably if you went to at least the 9850 (or even a Phenom II X4, if your motherboard can handle it), you would be fine CPU-wise.
GPU-wise, I wouldn't expect to run at super-high quality at high resolutions. But if you turn the eye-candy down, you should at least hit playable FPS.
The big question is your OS. Unless you have 64-bit Windows, you're not going to be able to run it.