4 Things to Know About the ASUS PRIME B660M-A’s PCIe Slots
- The primary x16 slot runs PCIe 4.0 x16 from the CPU, which is sufficient for current-gen graphics cards.
- The second x16 slot drops to PCIe 3.0 x4 through the chipset, so don’t expect full bandwidth for a second GPU.
- Two PCIe 3.0 x1 slots are available for smaller expansion cards like Wi-Fi or sound cards.
- This layout is practical: Gen 4 for the graphics card, Gen 3 for everything else.