I recently built my own PC with a Ryzen 5 5500, RX 6600, and MSI MPG B550 Gaming Plus motherboard, among other components. However, I'm having issues with the primary M.2 slot under the heat sink—it's not detecting my SSD when I boot into BIOS. I've made sure it's properly seated, checked for disabled settings in BIOS, updated the BIOS to the latest version, and even tried another M.2 SSD from my laptop, but nothing works there. The M.2_2 slot works fine, but I really need to figure out why the primary slot won't cooperate. Is it possible that this is related to the CPU? I know the Ryzen 5 5500 doesn't support PCIe Gen 4 lanes, but shouldn't it fallback to Gen 3? Any ideas on what might be causing this?
2 Answers
I totally understand the frustration! Lack of M.2 slots can be a hassle, especially if you were planning to use two SSDs. It definitely sounds like this is more of a CPU limitation rather than an issue with your motherboard itself. As for the speeds, if you're not transferring huge amounts of data frequently, you might not see much difference in day-to-day tasks.
It seems like you're running into a limitation with your CPU. The motherboard’s design dictates how PCIe lanes are allocated, and it looks like your Ryzen 5 5500 might not fully support that primary M.2 slot. The good news is that in typical use, the speed variance might not be noticeable unless you're constantly transferring tons of data. If you need to utilize two M.2s, you may need to consider upgrading your CPU for better lane support.
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