Gaming PC (£300-400 budget)

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD A8-6600K 3.9GHz Quad-Core Processor (£83.99 @ Aria PC)
Motherboard: ASRock FM2A75 Pro4-M Micro ATX FM2 Motherboard (£59.36 @ Amazon UK)
Memory: Patriot Viper 3 8GB (2 x 4GB) DDR3-1600 Memory (£52.10 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£45.59 @ Aria PC)
Case: Cooler Master NSE-200-KKN1 MicroATX Mid Tower Case (£33.24 @ Dabs)
Power Supply: XFX 450W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£34.99 @ Maplin Electronics)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£13.15 @ Amazon UK)
Operating System: Microsoft Windows 8 (OEM) (64-bit) (£69.59 @ Aria PC)
Total: £392.01

This is the best I could come up with - it isn't great. You can't build a gaming PC on a budget like that, to be totally honest - £500 is pretty much the bare minimum for a gaming PC.
 
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