hello,
i recently "upgraded" my unraid box from 11th gen intel to AMD AM5 (wanted more cores for docker). my SSD cache drives are enterprise U.2 drives that I connected to the M.2 slots using some gigabyte M.2 to U.2 adapters. on intel platforms these work in every M.2 slot, regardless of whether it's mapped to the CPU, the chipset or split with PEX switch. on AM5 platforms, these adapters only work when plugged into M.2 slots that connect directly to the CPU (see attachment so you know what i mean). i tried gigabyte, asus and MSI motherboards. 8 different models in total. same result every time.
the drives won't show up in the BIOS when connected to a slot going to the chipset
i also have a PCI-E to U.2 adapter, and same thing happens. works in PCI-E slots mapped to the CPU, will not work in PCI-E slots mapped to chipset. and again, on intel it worked when plugged in anywhere. even if the slot only had 1 gen 2 PCI-E lane, it still worked.
i can't figure out a reason for it, or how i'd go about fixing it. if anyone can clue me in, i'd appreciate it.
thanks
i recently "upgraded" my unraid box from 11th gen intel to AMD AM5 (wanted more cores for docker). my SSD cache drives are enterprise U.2 drives that I connected to the M.2 slots using some gigabyte M.2 to U.2 adapters. on intel platforms these work in every M.2 slot, regardless of whether it's mapped to the CPU, the chipset or split with PEX switch. on AM5 platforms, these adapters only work when plugged into M.2 slots that connect directly to the CPU (see attachment so you know what i mean). i tried gigabyte, asus and MSI motherboards. 8 different models in total. same result every time.
the drives won't show up in the BIOS when connected to a slot going to the chipset
i also have a PCI-E to U.2 adapter, and same thing happens. works in PCI-E slots mapped to the CPU, will not work in PCI-E slots mapped to chipset. and again, on intel it worked when plugged in anywhere. even if the slot only had 1 gen 2 PCI-E lane, it still worked.
i can't figure out a reason for it, or how i'd go about fixing it. if anyone can clue me in, i'd appreciate it.
thanks
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