My build, according to pcpartpicker need 494w. I have a 600w psu. Should I go higher?
The 494w is calculated based on the maximum power draw for each component according to the manufacturer. Your PC will only draw this much power if you are managing to stress every component completely all at once. So no, you don't really need a higher wattage power supply. Now, real world power draw can differ from what the manufacturer states, so people like to be safe and buy larger than absolutely necessary. This is generally a good idea, but you've already got that covered on this system with a 600w supply. The only reason you would need to go higher is if you plan on upgrading with more components later or want to do a lot of overclocking.
If you take the output of the 12v amperage and multiply it by 12, you will get the available wattage for the motherboard, cpu, and gpu. In this case, (46A x 12 = 552 watts available for the cpu and gpu) and 130w for the rest of the components.
On avg, a 280x draws around 239w at load.
The FX-8350 draws around 239w at load(benchmark stressed).
Tomshardware gets 182w for their powerconsumption test (stock). http://www.tomshardware.com/reviews/fx-8350-vishera-review,3328-16.html
So power consumption is pretty accurate from pcpartpicker. The psu should be fine but if you feel uncomfortable, get a 650w psu and remember to look at the 12v rail. I highly, highly, doubt that you would pull more than 500w unless you did some heavy overclocking maybe.
If you want some other psu options these may be decent option for "cheap".
Thermaltake Smart SP650w
Rosewill Arc M650
Thermaltake Smart SPM650w
Thanks for the help. I do plan on overclocking some but I'm going to keep the PSU I have now. Sending it back hardly seems worth it with the restocking fee and shipping costs and as long as it should be good enough I'm not going to bother with it. Thanks again, I appreciate it.
The psu has OCP/OVP protection so it won't blow up. Worse case scenario is that the psu can't support it and you'll get artifacts/lag/low fps while gaming. That's when you know you don't have enough watts. If anything just don't overclock like crazy.