To be honest, you're PC is very outdated and ancient. The 450w of Iball is useless. The company is no good for gaming. Get a 550w or 650w of coolermaster or gigabyte. Upgrade to atleaset 8GB ddr3 ram @1600Mhz. Get a bulldozer FX4100 processor as its cheap and good. The P5KPL-AM/PS is veryy old. Get a GA-880GM-USB3 Motherboard as its cheap and supports 7770 with 2.0 PCIe x16.