CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ TigerDirect)
Motherboard: Gigabyte GA-78LMT-S2 Micro ATX AM3+ Motherboard ($47.49 @ Newegg)
Memory: Corsair 8GB (2 x 4GB) DDR3-1333 Memory ($74.34 @ NCIX US)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: PowerColor Radeon HD 7790 1GB Video Card ($109.99 @ Newegg)
Wireless Network Adapter: Encore ENUWI-1XN4M 802.11b/g/n USB 2.0 Wi-Fi Adapter ($8.80 @ Amazon)
Case: Gigabyte GZ-P5HB5C (Black) ATX Mid Tower Case ($23.99 @ Amazon)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($19.99 @ Microcenter)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($81.99 @ NCIX US)
Total: $536.56
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-01-02 17:44 EST-0500)
(Generated by PCPartPicker 2014-01-02 17:43 EST-0500)
Slightly over, but this includes the OS, so I don't know. Hope this helps.