Help with NVME M.2 and Toshiba ocz rd400

Hi all,

I'd like to build a Hackintosh so I was looking at a 512gb Toshiba ocz rd400 512gb to use as my main hdd (since it's way easier to setup up than a Samsung 960EVO). My question is - does my motherbaord Gigabyte Z170X-Ultra Gaming M.2 support speeds that can be reached with a PCIE adapter?

Originally wanted to get an rd400 with a PCIE adapter but this is not possible yet in Europe (only 128gb and 1TB version are sold on amazon). Would it be possible to purchase only the PCIE adapter in the future?

Thanks.