I entered your info into a power supply calculator and if you went with GTX470 in SLI you need about a 800-850W power supply (this is just a rough estimate). The link below will give you a little more inormation, too.
For a system using a single reference clocked GeForce GTX 470 graphics card NVIDIA specifies a minimum of a 550 Watt or greater power supply that has a combined +12 Volt continuous current rating of 38 Amps or greater and that has at least two 6-pin PCI Express supplementary power connectors.
For a system using two GeForce GTX 470 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 750 Watt or greater power supply that has a combined +12 Volt continuous current rating of 56 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.
Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.
Overclocking of the CPU and/or GPU(s) will require at least an additional 5 Amp increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the CPU and GPU overclocking.
The Rosewill Green Series 530W (RG530-2 / RG530-S12), with its combined +12 Volt continuous current rating of 41 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is barely sufficient to power your system configuration with a single overclocked GeForce GTX 470.
Ok thank you for the thorough answer! Could that be I can't overclock any further without running into issues?
Just curious what is holding me back from going farther, I know my card and CPU are capable im just not sure what's holding them back. I don't know that I need a new psu tho.
Any suggestions? I would like to stay at or below $100 if possible
If you're prepping for two GeForce GTX 470 in 2-way SLI mode you really don't have a choice. You have to get a new power supply unit.
If you're sticking with one GeForce GTX 470 for the time being then you'll have to back off on your overclocking or else you'll start to run into system stability problems when the power supply is unable to deliver the +12V current needed by the CPU and GPU.