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September 13th, 2025 11:13
Dell Precisio9n 7520: PCIe training issue.
Hi,
I picked up a 7520 which has the "pcie training error pci tag 0100 vendorid-10de" issue. Finding out as much as possible on this, it appears to be either the Quadro card or the mainboard. Given that the 7520's have a MXM GPU, can I use any MXM-A card in the slot just for BIOS test/diagnosis? (so not going anywhere near windows and driver issues.) This would let me test the motherboard (assuming the "test" GPU is good".
I also have a 7720, which takes MXM-B, again for the purposes of diagnostics, could I put the MXM-A GPU in the 7720 for a few minutes?
Thanks
Alex
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user_87d4d9
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September 18th, 2025 17:30
So an update on this:
I bought a Quadro K1100M (the cheapest Dell MXM-A I could find on ebay ;) ). Many turns of the screwdriver later I installed it and ran the onboard diagnostics.......all passed 100%. I ran it several times to make sure, and once it was nice and toasty too. No more "training error". So in this case, it appears to be a GPU failure not a motherboard failure.
I did have to meddle a little with the driver file to recognise the card under Windows 11 (may online guides on this one), but it didn't take long to do, and turn off driver signing too. Once that was all done, I've had 100% system stability so far (about 3 hours and several reboots).
I make no claim that this is THE fix for anyone else having issues, but a £15 GPU was a better investment for diagnostics over £70 for a motherboard, only to find it was the GPU.
ejn63
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September 13th, 2025 14:33
The short answer is no to "any" MXM-A card -- if you use one the system firmware doesn't recognize (and it's coded for only those cards this model shipped with), you'll either need to rewrite or patch the firmware or the card won't work. The -A vs -B refers to the size of the card -- so a -B should work as long as you can make it fit into the system. That said, also bear in mind it's not uncommon for the heatsink needed to be card-specific -- for testing, that may not matter but for an upgrade, it will.
user_87d4d9
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September 13th, 2025 14:46
@ejn63 Hi (again ;) )
Yea, I know the A and B's are different sizes. At this point it is purely diagnostic. Basically I'm trying to eliminate which is the duff one in the equation and then go from there. Sod's Law says that if I replace the GPU, it will be the motherboard, and vice-versa, so I really only need things to work sufficiently to get through the Dell diagnostics.
I suspect if I try with no card in the slot, it will simply not test as effectively there is nothing to test.
I'm not overly worried about having a discrete GPU either, so I could just run it without the add-in, and just run off the built-in Intel one.
The short of it is, I took a punt on a cheap laptop to try and fix. Several of the others I've dealt with over the last few months have just been flat BIOS batteries which caused them to hang at the logo - seems a flat battery causes more issues than no battery.
Thanks for your help :)
(edited)