Micro sized pc --> http://uk.pcpartpicker.com/p/39SQc
CPU: AMD Athlon X4 760K 3.8GHz Quad-Core Processor (£58.00 @ Ebuyer)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.44 @ Aria PC)
Motherboard: ASRock FM2A75M PRO4+ Micro ATX FM2+ Motherboard (£52.66 @ CCL Computers)
Memory: Kingston Beast 8GB (2 x 4GB) DDR3-1600 Memory (£59.94 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£39.14 @ Aria PC)
Video Card: MSI Radeon R9 270 2GB Video Card (£131.64 @ Scan.co.uk)
Case: Cooler Master N200 MicroATX Mid Tower Case (£32.99 @ Novatech)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£44.98 @ Amazon UK)
Operating System: Microsoft Windows 8 (OEM) (64-bit) (£74.67 @ Ebuyer)
Total: £519.46
ATX sized pc --> http://uk.pcpartpicker.com/p/39T07
CPU: AMD FX-6300 3.5GHz 6-Core Processor (£77.99 @ Aria PC)
Motherboard: Asus M5A97 EVO R2.0 ATX AM3+ Motherboard (£68.62 @ Amazon UK)
Memory: Kingston Beast 8GB (2 x 4GB) DDR3-1600 Memory (£59.94 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£39.14 @ Aria PC)
Video Card: MSI Radeon R9 270 2GB Video Card (£131.64 @ Scan.co.uk)
Case: Zalman Z5 Plus ATX Mid Tower Case (£38.68 @ Scan.co.uk)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£44.98 @ Amazon UK)
Operating System: Microsoft Windows 8 (OEM) (64-bit) (£74.67 @ Ebuyer)
Total: £535.66
NO operating system ---> http://uk.pcpartpicker.com/p/39T3r
CPU: AMD FX-8320 3.5GHz 8-Core Processor (£104.39 @ Ebuyer)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.44 @ Aria PC)
Motherboard: Asus M5A97 EVO R2.0 ATX AM3+ Motherboard (£68.62 @ Amazon UK)
Memory: Kingston Beast 8GB (2 x 4GB) DDR3-1600 Memory (£59.94 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£39.14 @ Aria PC)
Video Card: MSI Radeon R9 270 2GB Video Card (£131.64 @ Scan.co.uk)
Case: Zalman Z5 Plus ATX Mid Tower Case (£38.68 @ Scan.co.uk)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£44.98 @ Amazon UK)
Total: £512.83
750ti vs HD7870 (R9 270) http://www.anandtech.com/bench/product/1130?vs=1034