RIF6 PRO PCIe powered USB riser

I just bought 8 of these to hook up to the Gigabyte motherboard. I will be using only six gpu cards to start out and see the performance.  Although they are pcie x1 to pcie x16, it should not hurt the performance because the gpu does the work on the card and then uses the X1 signal to transmit the information back to the board.

http://www.amazon.com/RIF6-PCI-E-Adapter-Extension-SATA-powered/dp/B00IKT1OGM/ref=sr_1_2?ie=UTF8&qid=1426433560&sr=8-2&keywords=RIF6