Palit 580 with windforce 580, SLI?

[Zdos123]

I have bought a windforce nvidia geforce gtx 580 as a replacment card for the palit but it turned out that the palit wasn't broken. I was thinking of putting in SLI, would this be possible? (Both have the same VRAM 1.5GB)

 

[ThatVietGuy]

You can, but you'll need a pretty high wattage PSU to do it.

At least 900W according to this - http://www.realhardtechx.com/index_archivos/Page362.htm