is this a good gaming pc

Those builds are the same. Is that your current build or something your buying because the some of those parts such as the CPU/MB & RAM are older and for the same price you can get a Kaby Lake system.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-7500 3.4GHz Quad-Core Processor ($196.73 @ SuperBiiz)
Motherboard: Gigabyte GA-B250M-DS3H Micro ATX LGA1151 Motherboard ($73.98 @ Newegg)
Memory: G.Skill NT Series 8GB (2 x 4GB) DDR4-2400 Memory ($57.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.33 @ OutletPC)
Video Card: MSI Radeon RX 480 8GB ARMOR 8G OC Video Card ($219.99 @ B&H)
Case: Corsair 100R ATX Mid Tower Case ($49.99 @ B&H)
Power Supply: Corsair CXM 550W 80+ Bronze Certified Semi-Modular ATX Power Supply ($60.98 @ Newegg)
Total: $708.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-02-10 19:37 EST-0500