I'm actually running on a gaming rig I built for just under $700, and I have yet to meet its limit. I have a AMD Radeon HD 7970 Graphics card (another good one is the NIVIDA GEforce GTX 670), a NZXT PHANTOM case, an Intel ivybridge i5-3570k CPU, and a gigabyte ultradurable motherboard (forgot full name), as well as a 750 watt power supply (also forgot full name).
