500w PSU enough for my new GPU? cooling?

WalkingTarget

Honorable
May 30, 2013
4
0
10,510
I'm adding

My current setup;

Core i5-2310 2.9ghz
Standard Insprion 0GDG8Y motherboard
2x4gb ddr3
1x SATA HDD
1x PCI Ethernet
2x cooling fans (1 cpu, 1 case)

Looking to change out my current GPU (Radeon hd 6450) for an Nvidia GTX 660 2gb, which is basically a quantum leap.

Thermaltake's system calculator says i'll need around 375w and recommends a 430 w PSU. I'm thinking just going for the 500w to give a little breathing room.

Also thinking of adding another case fan for additional cooling.

Thoughts?