Will this rig play games on normal/high?

Will it be able to play games like Minecraft with shaders or GRID 2 or NFS: HP on medium?

Processor: AMD A10-6800K 4.1GHz Quad-Core Processor

Motherboard: MSI A78M-E35

RAM: Corsair Vengeance Pro 8GB (2 x 4GB) DDR3-1866 Memory

HDD: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive

Graphics Card: EVGA GeForce GTX 650 Ti Boost 2GB Video Card

PSU: Antec EarthWatts Green 500W 80+ Bronze Certified ATX Power Supply

Estimated wattage: 329W

P.S. Will it need more power to run smoothly? I might upgrade.

Added (1). UPDATE: I might switch the processor to an AMD A10-5800K or AMD Athlon x4 760k. Will it still have the same performance.better performance?

Yes.