Will I need a stronger PSU to go 970 SLI?

[sinovin]

This is my build right now: http://pcpartpicker.com/p/73YhrH

According to that link and the eXtreme PSU Calculator site I am currently using around 380w (without overclocking). If I wanted to add an additional 970 AND overclock my CPU, would I need a better PSU? If so would 800w be enough?

 

[alexoiu]

If not OC-ing, 650W should be ok: http://www.guru3d.com/articles-pages/geforce-gtx-970-sli-review,4.html
Otherwise, yes, 800 W should be enough.

 

[marek_shields]

One benchmark page I was looking at put that card at ~213 watts during a Furmark Stability Test at 1280x1024 0xAA. When gaming with Metro Last Light at max settings at 1920x1080, it used 192 watts. So, to be on the safe side, I would round up to 220 watts per card and double that for SLI which would put you at 440 watts for the two cards.

Without the two cards in the build, that calculator says you are using 222 watts so with the two cards that puts you at 662 watts with 128 to spare for overclocking. As far as overclocking goes, I am by no means an authority but I think you should have enough overhead for that if you aren't overclocking by some crazy amount.

Here is the page I got the card's power usage from in case you are interested: http://www.techpowerup.com/reviews/MSI/GTX_970_Gaming/25.html