I apologize as i'm not altogether too familiar with the new M.2 storage on motherboards. I have two rigs. One with a ASUS PRIME Z90-P and one with an ASROCK 7Z90 Steel Series. Both currently have one M2 NVME SSD. I would like to add another SSD to both rigs.
Z790-P has this:
M.2_1 slot (Key M)...