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You will definitely want at least 1000.
I find it awkward though how power is processed on the 690. One 690 uses around 425 watts, where quad SLI would require 800+.
SLI 680s or 670s would fair ok on a 650 watt psu too. O well.
It's to run a 2560x1440 2B Catleap so I can get around 100 FPS in current gen games etcI would go with the 7970's if your planning on investing in three cards for multi-display.
It's interesting because it seems that the card uses only 350w so I would assume two would pull ~700w
Assuming all the GPUs are being used
Regardless thanks for the info guys I think I'm gonna stick with my gut and go with 3 7970/670s whatever I feel for at the time.
I am pretty sure your power supply can't support 3 7970. Each 7970 is rated at 250W TDP, 3 of them will pull 750w and that would only leave 100W for rest of your system if your power supply can deliver 850W on 100% efficiency. In real test from anandtech, http://www.anandtech.com/show/6025/radeon-hd-7970-ghz-edition-review-catching-up-to-gtx-680/16 , the load power of one 7970 pulled 288W when playing metro 2033 (system load power 391W - system idle power 103W), and the load power of one 7970GHz draws 329W. Three of them would be 864W and 987W respectively. Considering a good power supply runs at 85% efficiency, and rest of the system requires 150W, you would need a 1200W power supply to trifire three 7970s, or a 1350W power supply to trifire three 7970GHz at minimum.
It's to run a 2560x1440 2B Catleap so I can get around 100 FPS in current gen games etc
Aiming for a minimum of 40 in most titles.