Im building a new computer with an I7 3770k, 2 Gigabyte GV-R787OC-2GD, 16 gb vengence ram, GA-Z77X-UP4 TH mobo, Zalman
Z11 Plus case, Seagate ST2000DM001 HD, and i have 2 questions.
1. What size power supply do i need?
2. Will Cooler Master Hyper 212 EVO RR-212E-20PK-R1 fit?
Radeon HD 7870 - On your average system the cards require you to have a 550 Watt power supply unit as minimum and 700 Watt if you go with two cards in Crossfire mode.
If you are going to overclock the GPU or processor, then we do recommend you purchase something with some more stamina. Source: http://www.guru3d.com/articles_pages/gigabyte_radeon_hd_7870_oc_review,7.html