I built a system for my son's girlfriend (MSI 970A-G46 motherboard, AMD FX-6300 CPU, Corsair H60 cooler, Crucial 8GB DDR3 RAM, 120GB SSD, 2TB WD Hard drive, EVGA GTX-760 video card, Corsair 300 case, 14" case fans and a DVD RW drive.
The system loaded Win7 (and Win8) just fine but after a day...