With this build, you'll be able to just put every single setting on its maximum, and play with very smooth FPS, on Battlefield 4 :
PCPartPicker part list:
http://pcpartpicker.com/p/1zMiP
Price breakdown by merchant: http://pcpartpicker.com/p/1zMiP/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1zMiP/benchmarks/
CPU: AMD FX-8320 3.5GHz 8-Core Processor ($144.99 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.99 @ Microcenter)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard ($93.98 @ Outlet PC)
Memory: G.Skill Sniper 8GB (2 x 4GB) DDR3-1600 Memory ($58.50 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ Outlet PC)
Video Card: Sapphire Radeon HD 7970 3GB Video Card ($308.98 @ SuperBiiz)
Case: Corsair 300R ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($45.99 @ NCIX US)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.99 @ Newegg)
Total: $807.39
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-03 23:46 EDT-0400)