I would go no less than 500 watts for your build, maybe even 600watts. 8 cores and a dedicated graphics card will require quite a bit of power. Also considering capacitor aging, a 430watt PSU might work fine for a little while, but over time will lose its ability to power your components. Ideally, you'll want to calculate the average wattage your components will use, then get a PSU with 20% more wattage than that. To find out, google "power supply calculator" and get an idea of what you'll need.