3 things I wish I knew before I filled every M.2 slot on my motherboard
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Filling all M.2 slots on a modern AM5 motherboard comes with hidden trade-offs that are easy to miss in spec sheets. On many X870 boards, populating the second M.2 slot forces the primary GPU PCIe slot to drop from x16 to x8, halving GPU bandwidth. On boards that avoid this, the trade-off shifts elsewhere — typically to USB4 port availability or reduced SSD bandwidth (PCIe 5.0 x2 instead of x4). Third and fourth M.2 slots run through the chipset rather than the CPU, limiting them to PCIe 4.0 speeds and shared chipset bandwidth, and on some boards can disable SATA ports entirely. The key takeaway: always read the fine print and footnotes on motherboard spec sheets before assuming all M.2 slots are equally capable.
