Your mobo (Gigabyte GA-Z97X-UD5H) support all SATA III(6Gb/s) at any ports. So you can technically put your SSD in any of those port.
"Chipset:
1 x M.2 PCIe connector
(Socket 3, M key, type 2242/2260/2280 SATA & PCIe SSD support)
1 x SATA Express connector
6 x SATA 6Gb/s connectors (SATA3 0~5)...