B450M PRO-VDH MAX Motherboard

pcie m 2 slot   Dan pcie 20 x16 slot

2 connector are PCI Express x4 , Serial ATA , and USB It is up to the manufacturer

Best AMD AM4 B550 MATX motherboard, lightning PCIe , lightning , USB Gen 1, heatsink, wifi AC, powerful overclocking, MSI PRO  Dual Channel DDR5：2*SMD DIMMs with AMD EXPO™ & Intel® XMP Memory Module Support; SuperSpeed Storage：PCIe x4 Connector; EZ-Latch：PCIe x16 Slot with

slot ngaso77 HP only sent the units out with those two capacities But there is no limit as to what you use You can install a 1 or 2 TB SSD if you can find one  Specifications ; NCTF Ground Ball Definition for PCIe BGA SSD ECN , , ECN ; OCuLink Cable Spec ECN The IL fitted IL requirements