eight hundred dollars

[RoraOmni]

what can I build?! game machine?

 

[lonewolf7]

Yes you can build a gaming PC :

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($219.96 @ SuperBiiz)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($134.99 @ SuperBiiz)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($77.99 @ Newegg)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($79.99 @ Amazon)
Video Card: Asus GeForce GTX 760 2GB Video Card ($259.99 @ Newegg)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($55.99 @ Mwave)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($59.99 @ NCIX US)
Monitor: Asus VS247H-P 23.6" Monitor ($145.58 @ Newegg)
Keyboard: Logitech MK320 Wireless Standard Keyboard w/Optical Mouse ($26.99 @ B&H)
Mouse: Logitech G500 Wired Laser Mouse ($67.05 @ SuperBiiz)
Speakers: Creative Labs A220 9W 2.1ch Speakers ($27.81 @ Mwave)
Total: $1131.36
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-17 09:53 EST-0500)