970 PRO GAMING/AURA does not support 220 watt TDP (Thermal Design Power) CPUs such as the FX-9590 CPU. I suggest you try reading the CPU Support List.
https://www.asus.com/us/Motherboards/970-PRO-GAMING-AURA/HelpDesk_CPU/
The Thermal Design Power (TDP) is the average maximum power a processor can dissipate while running commercially available software. TDP is primarily used as a guideline for manufacturers of thermal solutions (heatsinks/fans, etc) which tells them how much heat their solution should dissipate.
If you take the time to read the downloadable motherboard manual, you will see on the 970 PRO GAMING/AURA the M.2 storage is for DATA only (not Bootable).
https://www.asus.com/us/Motherboards/970-PRO-GAMING-AURA/HelpDesk_Manual/
I suggest you look at
AMD 990FX - GA-990FX-Gaming (rev. 1.1)
http://www.gigabyte.com/support-downloads/cpu-support-popup.aspx?pid=5825
M.2 connector (Socket 3, M key, type 2242/2260/2280 SATA and PCIe x4/x2/x1 SSD support)
•PCIe Gen2 x4 M.2 Connectors with up to 20Gb/s Data Transfer (PCIe NVMe & SATA SSD support)