Corsair has discontinued their older vs450 which OP has. CORSAIR - PSU Review Database
If we go by the label it is 30A(360W/12V) net on +12V with each individual 12V output(12V1 and 12V2) with there individual rated amps.
There was some confusion regarding the amperage of +12V net output for the point whether it was 22A(as mentioned on their product page then) or 30A.
Corsair VS450 Power Supply (CP-9020009) - The Corsair User Forums
The thing with that model(old one) is that there is almost no proper review which throws some light on its actual load distribution during load testing,all we have is a label.If it is 30A net on +12V output then it should run the setup well enough provided there is no heavy OCing.Not saying that 30A rating on +12V of that model is wrong but there is no proper validation of that which i have come across.
Get a seasonic s12ii 520w and you do also be able to overclock your GPU without any worry.One time investement in a good PSU,would be able to handle most of the presently available high-end GPUs.Or at least get vp550p and sell this one.You can even go for vp450p/cx430 bronze but they might not be much of an upgrade instead may be a sidegrade.