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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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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)