I have decided to upgrade on my current build which is really Banana.

My current specs are
CPU AMD Athlon X2 240 2.8Ghz
MOBO Gigabyte N61PME-S2P
GRAPHICS 9400 GT
RAM 2GB DDR2
PSU 500W

Ok thats my current build.This is the upgrade I want to do, and I will be able to play games on it such as call of duty and fallout new vegas. I have decided on a new Cooler Master CM690 II Case and a
Graphics card, the XFX HD-577X-ZMF3 Radeon HD 5770 1GB. My question is will it work on my current build. my motherboard is a Micro ATX and I dont know if I need a bigger motherboard.
Can anyone tell me if this build will work out fine ?