What PC component needs upgrading and what to?

[Tommy Cooney]

Hi, my PC specs are:
.Corsair 500Watt PSU
.ASUS A58M-A
.AMD A8-5600 Quad Core 3.6GHz
.Samsung 8GB (2x4GB) DDR3
.1TB 7200RPM SATA 3 Hard Drive
.nVidia GeForce GTX 660 2GB
.Microsoft Windows® 8.1 64-bit

I am fairly new to computers and I have no idea which specs are relevant. I play games such as farcry 3, battlefield 4, call of duty black ops 2 ect. However I think I may need an upgrade somewhere, as I want to play games such as farcry 4, the division and other next gen games coming up. I got my PC from http://www.powerc.com/uk/ps/Gaming%20AMD%20Base%20Unit/1/code/cs-game-el/act/gpage here. I'm not sure wether to upgrade my CPu or GPU and whether that means I need a new motherboard.
I'm extremely confused and any help would be appreciated. Also I cannot spend huge amounts of money. Thanks!

 

[badboyrog2]

replace cpu and mobo as soon as possible