It seems like everyone uses 1x to 16x risers, even if its plugged in to a 16x slot. Should I expect any issues with my GIGABYTE GA-970A-UD3P if I use the USB powered risers here http://www.magicgrowing.com/bitcoin-mining/pci-e-powered-riser-card-100cm-40-usb-cable/ ? I only have a 7970 and an R9 270 right now, just looking to open it up some more.