Is this computer good for gaming?

well that power supply is below recommend wattage of 550 and not made for high power gaming systems. you will probably have a problem with it. i would recommend raising your budget and getting a better cpu/mobo. the athlon will most likely be a bottleneck for that gpu.
 
buy this instead:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-4160 3.6GHz Dual-Core Processor (£94.98 @ Ebuyer)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard (£34.99 @ Novatech)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR3-1600 Memory (£34.04 @ Amazon UK)
Storage: Western Digital Caviar Blue 500GB 3.5" 7200RPM Internal Hard Drive (£34.70 @ Amazon UK)
Video Card: MSI Radeon R9 380 4GB Video Card (£156.99 @ Amazon UK)
Case: Cooler Master N300 ATX Mid Tower Case (£34.52 @ Amazon UK)
Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply (£67.85 @ Amazon UK)
Optical Drive: Samsung SH-118CB/BEBE DVD/CD Drive (£8.75 @ Amazon UK)
Operating System: Microsoft Windows 10 Home Full (32/64-bit) (£84.90 @ More Computers)
Wireless Network Adapter: Edimax EW-7612PIn 802.11b/g/n PCI-Express x1 Wi-Fi Adapter (£16.99 @ Amazon UK)
Monitor: BenQ GL2250HM 60Hz 21.5" Monitor (£89.99 @ Amazon UK)
Keyboard: Dell KB212-B Wired Ergonomic Keyboard (£8.09 @ Amazon UK)
Total: £666.79
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-02-04 06:45 GMT+0000
 
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