Upgrading a Pc - What parts?

  I am a bomb 17:11 16 Nov 2016

Okay so I have £500 to spend on upgrading my computer but I'm not to sure which parts will actually work, not sure if this sounds stupid but whatever lol.

My current pc specs are listed below.

Case: Aerocool cyclops advance midi tower gaming case - red

Graphics Card : Asus GeForce GTX 960 TURBE OC 2048mb GDDR5 PCI-Express Graphics Card

Heat Sink : Alpenfohn sella CPU-Kuhler, SL-bukj COAF-027

Memory : TeamGroup Elite Black 16GB 2x8GB DDR3 PC3-12800C11 1600MHz Duel Channel Kit

Motherboard : MSI 970A-G43 AMD 970 (socket AM3+) DDR3 ATX Motherboard

Power Supply : Superflower FX 650W '80 Plus Bronze' Power Supply - black

Processor : Amd Piledriver FX-4 Quad core 4300 3.80GHz (socket AM3+) Processor - Retail

I want to upgrade my graphics card and processor, but if I do this I'm pretty sure I will have to upgrade my current power supply. I would just pick some things and buy them but I don't know how to find out if they will even attach to my pc.

I use my computer for multitasking purposes and gaming, which is why I want a better graphics card and cpu, I often see me cpu is at 100% usage so I think that is saying something in itself.

If someone could just give me some advice that would be really helpful. Thanks

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