Very helpful, especially for persons wanting to try out mining for Altcoins.

If I was to install a 4th 7950-GPU on the following m/b

http://www.newegg.com/Product/Product.aspx?Item=N82E16813128514&Tpk=990fx%20ud3&IsVirtualParent=1

via the PCI Express x1

(and the other three naturally on the PCI Express 2.0 x16)

can someone pls recommend a Riser card for that; a URL would be great.

And which PSU could power this system?