Difference between VX450W and CX600W

Yea guess Superlight, hopefully it shoudnt be too hard to figure out;)

The specs are on the Corsair website. Look under "Resources" for the PSUs in question.

For the system in your sig, 2infinity, which is lower component-count build with a single GPU (exactly what CX is designed for), CX will give you more useable power.