I'm about to upgrade my rig to an h97 anniversary board and eventually plan on running 6 gpus off it. Will windows 7 with 6GB ddr3 ram be able to handle 6 gpus? Or should I use Ubuntu (which I don't prefer) or ethOS. Currently I am running an 850w psu for 3 cards so would buying an identical one be sufficient? And could someone please give me a link for the 1x to 16x risers they use and trust because I purchased two usb powered ones from Amazon and I'm convinced they don't work after hours of testing on multiple systems. Thank you for your help!