its a good mobo, check the specs what you get on it:
6 x SATA 6Gb/s port(s), red, with M key, type 2242/2260/2280 storage devices support
Support Raid 0, 1, 5, 10
Supports Intel® Smart Response Technology, Intel® Rapid Start Technology, Intel® Smart Connect Technology *3
1 x M.2 Socket 3, black, with M Key, type 2260/2280 storage devices support (PCIE mode)
ASMedia® PCIe SATA controller : *4
2 x SATA 6Gb/s port(s), red, with M key, type 2242/2260/2280 storage devices support
and like you see you get only 1 m2 port with like you said "speed" aka PCIE mode, normal M2 sticks usualy work in Sata mode so the speed is the same as the SATA drives cca 500/500mb and nvme(PCIE) goes to 3500/3000. you have to have a M2 stick that supports...