The ASUS PRIME B660M-A runs PCIe 4.0 across its LGA 1700 board

What PCIe slots are present on the ASUS PRIME B660M-A?

The B660M-A runs Intel’s LGA 1700 platform with a mix of PCIe generations. The primary x16 slot gets PCIe 4.0 x16 from the CPU, good for current-gen GPUs. A second x16 slot drops to PCIe 3.0 x4 through the chipset, and there are two PCIe 3.0 x1 slots for smaller expansion cards. It’s a practical layout — Gen 4 for the graphics card, Gen 3 for everything else.