GPU upgrade.

[Caymss]

Hey folks,
I am currently running a HIS HD 7950 3072MB GDDR5, its decent but it ain't the best, also pretty old. I'm planning to upgrade and get probably a RX480.
This:
My basket at Overclockers UK:

• 1 x Sapphire Radeon RX 480 Nitro+ OC 8192MB GDDR5 PCI-Express RGB Graphics Card= £266.49

Total: £290.38
(includes shipping: £23.89)
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Also what is the best choice between them? Cuz there is hella of different models.
Here is my specs:
AMD FX-6 6300 4.20GHz (Socket AM3+) Six Core CPU
16GB 1600MHz DDR3
Gigabyte 990FXA-UD3 AMD 990FX (Socket AM3+) DDR3
Super Flower Leadex GOLD 550W

Just wanted to know if my PC can handle with it or not. Well, maybe you can advise something else - I am completely lost.

Thanks in advance for your help.

 

[Caymss]

Hmm, a'right guys. I will take a look. What about my PSU? Will there be enough power for it?