500 watts enough for RX 480?

Hi everyone, I am getting an RX 480 in like December and I wanted to be sure if my supply can handle it.
Rest of the specs are:
i3 540 (I know, a huge bottleneck)
8 gigs ddr3
and current gpu is XFX 9800 GT
So, is 500 watts enough?
 
Solution
Technically, 500w is enough for a 480, but it needs to be a GOOD 500w psu and not just any 500w psu.

So exactly which 500w psu do you have?