Gaming PC Build for £550

PCPartPicker part list: http://uk.pcpartpicker.com/p/32RB8
Price breakdown by merchant: http://uk.pcpartpicker.com/p/32RB8/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/32RB8/benchmarks/

CPU: AMD FX-6300 3.5GHz 6-Core Processor (£80.99 @ Ebuyer)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.44 @ Aria PC)
Motherboard: Gigabyte GA-990XA-UD3 ATX AM3+ Motherboard (£78.62 @ CCL Computers)
Memory: Kingston Beast 8GB (2 x 4GB) DDR3-1600 Memory (£59.98 @ Amazon UK)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk (£69.98 @ Amazon UK)
Video Card: PowerColor Radeon R9 270X 2GB Video Card (£144.99 @ Ebuyer)
Case: Corsair 200R ATX Mid Tower Case (£47.88 @ Aria PC)
Power Supply: XFX ProSeries 450W 80+ Bronze Certified ATX Power Supply (£34.14 @ Scan.co.uk)
Optical Drive: LG GH24NS95 DVD/CD Writer (£16.90 @ Amazon UK)
Total: £558.92
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-02 19:01 GMT+0000)

Here's something that can play a lot of games on good settings. You can always get a R9 270 and increase the size of your ssd to 256GB

Edit: I had the PSU for a lower end build...This new one would be better for that build.

PCPartPicker part list: http://uk.pcpartpicker.com/p/32RHv
Price breakdown by merchant: http://uk.pcpartpicker.com/p/32RHv/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/32RHv/benchmarks/

CPU: AMD FX-6300 3.5GHz 6-Core Processor (£80.99 @ Ebuyer)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.44 @ Aria PC)
Motherboard: Gigabyte GA-990XA-UD3 ATX AM3+ Motherboard (£78.62 @ CCL Computers)
Memory: Kingston Beast 8GB (2 x 4GB) DDR3-1600 Memory (£59.98 @ Amazon UK)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk (£69.98 @ Amazon UK)
Video Card: PowerColor Radeon R9 270X 2GB Video Card (£144.99 @ Ebuyer)
Case: Corsair 200R ATX Mid Tower Case (£47.88 @ Aria PC)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£44.98 @ Amazon UK)
Optical Drive: LG GH24NS95 DVD/CD Writer (£16.90 @ Amazon UK)
Total: £569.76
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-02 19:04 GMT+0000)