PCIE slot configuration in bios?
My first motherboard runs the 3x full size slots in a PCIE 3.0 4x configuration, with the single slot at 1x configuration.
What RAM (Memory) Is Compatible With My Motherboard?
X99 Motherboard, LGA 2011 Motherboard with 4 Channel DDR3 Memory Slots, M.2 Nvme NGFF Serial, ATA3.0 and ATA2.0 Ports, PCIe for I7.
Before Buying an ATX Motherboard, You Should Know These Facts
One of the most important differences between Mini ITX and the two ATX motherboard types is the number of RAM slots that the motherboard comes with.
First Picture of AMD B550 Motherboard Appears | TechPowerUp
Pictured below is a Micro-ATX format motherboard featuring two x16 PCIe 4.0 slots and one smaller, x1 slot. There are two DDR4 slots, along with M.2 PCIe 4.0 connector.