Try the new PCI-E to 4x USB v3.0 (V006S) with its gold plated circuitry. This adapter plugs into the PCI-E x1 port on your motherboard and allows you to connect up to 4 USB v3.0 wires for risers. It is very convenient and efficient for mining, especially for people who want to mine with a regular tower that does not have a motherboard designed for minning.
* You can remove the metal arm if necessary