Dual NVMe boot priority

[SavageAUS]

Hey guys,

I have a skylake setup with a gigabyte ga z170x gaming5, I have 2 Samsung NVMe drives on my board and every now and then my boot order keeps changing. NVMe 1 - windows 10, NVMe 2 - macOS Catalina, Clover, SSD 1 - Arch Linux, gummiboot, SSD 2 - spare. 
According to the manual the NVMe ports are as follows. 
M2D_32G

M2H_32G

So my assumption by alphabetical order is that M2D would be first priority - Windows 10, but when I go into bios it shows M2H drive above M2D. So would I be best switching the drives around to retain my preferred boot order or is this something else? I want Windows 10 to be the default and to access the other I want to press F12. 

[Mick Naughty]

So you just pick the windows boot manager as the primary. Mine only does the random switch when the system would crash from me bashing the table. But doesn't happen aside from that. 

 

But if physically moving the drives will put the windows first then go for it. I can only use certain spots for the nvme as it will take lanes from the gpu and actually lagged a bit when using both at the same time but was only periodically.