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BIOS 1302 M.2 SSD Issues

texaslonghorn
Level 7
I just updated the BIOS to the newest version 1302 from version 0706 and I'm unable to see my Samsung XP941 as a boot drive. I've enabled the M.2 configuration under Advanced/Onboard Devices Configuration after optimizing defaults after updating the BIOS. Has anyone else experienced this? Any ideas on how to get the drive to be recognized?

Thanks!
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9 REPLIES 9

Chino
Level 15

I had Windows 7 installed. The drive was recognized with the 0706 BIOS version and worked, but then I updated the BIOS and now I can't see the drive.

Did you try disabling CSM?

Artureld
Level 7
Strange, using an XP941 as well. Haven't run into this problem and i've got BIOS 1302 installed. Once I am home, I'll check out my settings and post them here.

I disabled the CSM and no luck. Anyone with some ideas?

Chino
Level 15
Looks like a more complicated problem than I thought. List your complete system specifications for me. If you have numerous GPUs and sound card, please indicate which PCIe lanes you're using.

texaslonghorn
Level 7
I have an Intel 5960X, EVGA GEFORCE GTX 750, and a Samsung 256 GB XP941. The videocard is connected in the PCIE_X16/X8_3 slot. The videocard and the SSD are the only items connected to the computer as of now. Thanks for your help everyone.

Korth
Level 14
Plug the GPU card into PCIE_X16_1 for best results.

Plug the M.2 card into any of PCIE_X8_2, PCIE_X4_1, PCIE_X16/X8_3, or PCIE_X8_4 - it won't fit into PCIE_X1_1 anyways.
The R5E design suggests PCIE_X8_4 is the preferred location, but I would recommend PCIE_X16/X8_3 as the "best" available slot if one GPU card and nothing else is plugged in.

If a second GPU card is installed (in PCIE_X16/X8_3, of course) the "best" slot for the M.2 is again PCIE_X8_4 - but, if chipset/PCH bandwidth isn't already being saturated with SATA/USB devices, and if airflow and space around the GPU cards is adequate, then I would actually plug it into PCIE_X8_2 to keep PCIe 3.0 bandwidth dedicated entirely to CPU-GPU traffic. There is a difference (in terms of real fps and benchmark performances), but it is generally small.

Your BIOS may impose additional limits on M.2-compatible slot placements.

RAIDs and boot/system drive configurations are sometimes "lost" (technically they become incompatible or may need their partitions and file systems rebuilt) after UEFI/BIOS updates. Best to always backup before updating firmware, be prepared to fully reinstall/restore your OS/system afterwards if necessary.
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[/Korth]

texaslonghorn
Level 7
I rolled back to the 0706 BIOS firmware and now the drive works perfectly...