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Title says it all.
My specs(Currently):
I would like to add in a GTX 960 to make this an SLI with the 970 I have. Will all of this work if I done this and would I need to upgrade the PSU as I don't want to upgrade PSU if not neccessary?
As Ash said, you can't SLI 2 different models of video card. They can be different manufacturer's and have different clock speeds but they have to be the same model and memory size. http://www.geforce.com/whats-new/guides/introduction-to-sli-technology-guide#4
Newegg and this Outervision site have psu calculators. http://images10.newegg.com/BizIntell/tool/psucalc/index.html?name=Power-Supply-Wattage-Calculator
http://outervision.com/power-supply-calculator
ANSWER: If you dont' have an optical drive and were to use 2 970's, Newegg recommends an 808W PSU.
***These posts mention being able to SLI non-matching GPU models in Win 10, with DX12 but it sounds like it will require the game to also be running DX12 and the game decides how to divide processing http://www.overclock.net/t/1568936/is-it-possible-to-sli-a-960-and-a-970-together
http://www.tomshardware.com/news/microsoft-directx12-amd-nvidia,28606.html
