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I'm running FreeBSD 15.0. No other PCIe devices attached. Not using the M2 slot. The H97 that is working well just has the one PCI-e 3.0 x16 slot and no other slots. The Z97 with the issues has 2 PCI-e 3.0 slots that share bandwidth working at x8 if using both, plus a bunch of other PCI-e 1.0...

Further update. I switched over to an Asus H97 mini ITX motherboard that I had removed in favour of the Z97 for more SATA ports and a later spec. So far after 4 or 5 reboots I am getting no lane errors and full 8x speed handshake with the 9300-8i card. I had to force Gen3 in the BIOS otherwise...

Update on this. I bought an Inspur LSI-9207-8i hopeful that it was just an issue with the HBA card itself. Sad to report it is not. Although it seemed a bit more stable at first, it eventually dropped down to 2.5x speed. I tried moving it to a different PCIe slot in my mobo (which I had tried...

@BLinux Thanks for the reply. I think it said x4 lanes, but I'll have to brave a restart to know for sure. For a good handshake, pciconf outputs: link x8(x8) speed 8.0(8.0) Most of the time when the handshake is bad, I guess this would appear as: link x8(x4) speed 8.0(2.5) That said...

Thanks for the reply. Yes, I've reseated it many times. Also tried the card in the other PCI-E 3.0 slot. I cleaned the contacts, but with an eraser rather than isopropyl. When screwing the bracket down It does affect the card seating, but it's barely perceptible and I've gotten stable...

I have an Inspur branded 9300-8i which has an unreliable handshake at boot with my Asus Z97 motherboard. When it handshakes with no lane errors, I get full 8x speed and no issues even under heavy disk IO until rolling the dice at the next boot. It will run for weeks or months. Most of the...