Device not detected in BIOS settings
Device not detected in BIOS settings
Hey there, everyone. I just finished some changes to my old gaming rig. I swapped out my CPU from the AMD Ryzen 5 2600 to a Ryzen 7 5700x and upgraded my RAM from 16GB to 32GB. The storage upgrade was moving from a WD Blue SN550 1TB NVMe drive to a WD Black SN850x 1TB NVMe unit. My original idea was to keep the old SN550 in a PCIe 2.0 slot on the motherboard for game storage, but it didn’t show up at all. I figured since the SN850x is PCIe 4.0, maybe it would work with my MSI B450 Tomahawk Max ii, which only supports up to PCIe 3.0. I thought maybe the SSD was dead, but when I swapped the drives and tried using the SN550 in the M.2 slot with the SN850x in the adapter, both got recognized. I’ve updated my BIOS to version 7C02vHB, re-seated everything, flashed the BIOS again, and cleared CMOS, but nothing changed. I’ve also experimented with PCIe settings and run the system in CSM mode, following most online advice. The thing is, the SN850x still works fine now, but I wanted to use it as a boot drive because of its DRAM cache. Even at PCIe 3.0 speeds, it should be twice as fast as the SN550—but it’s not. It’s odd since PCIe is backward compatible. Anyone have suggestions? The system runs smoothly now, but I’m curious about using the SN850x for booting. Thanks in advance!
When using the SN850x in the M.2 slot on motherboards, it fails to be recognized. However, placing it in a 16x PCIe M.2 adapter within one of the lower PCIe slots resolves the issue. My previous SN550 works without problems. I believe the problem stems from BIOS incompatibility. It would have been better to investigate more before buying the SSD.
The motherboard only supports PCIe 3.0 while the SN850x is PCIe 4.0. I thought it would function at 3.0 speeds, but it doesn’t seem to work. This seems like a more frequent issue than I thought. A BIOS update might fix it, but I’m likely to opt for a different SSD or a new motherboard instead.
The adapter should not contain any chips unless it supports multiple M.2 ports. It might include a PCIe MUX to work with systems lacking full PCIe support. Since NVMe uses PCIe, most boards connect directly without additional chips. My thought is the wording is odd—did you mean the B450 chipset is responsible for PCIe Gen 2.0? Anyway... To confirm, before you used the SN550, you replaced it with the SN850x and reused the 550 slot. The 850x still fits in the same M.2 slot but only provides PCIe 2.0 speeds now. In BIOS, under System Status > M2_1, it should appear correctly. This seems outdated; the latest version is 7C02v3I (October 28), and a beta version exists as 7C02v3H1. Note that MSI’s QVL lists official support for the Samsun 980 Pro in Gen 4.0 SSD models, while other options are limited to Gen 3.0 NVMe M.2.