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Can anyone tell if this is just a normal PCIe x8 slot in a funny position, or is it also an unusual (incompatible) pinout?

The differential pairs and the number of pins look about right but I thought I'd see if there is a PCIe expert who can comment. This is a Cisco UCSC-MRAID12G-2GB card.

We might like to use it outside of a Cisco UCSC with an 8x PCIe slot ribbon cable if it appears to be normal PCIe and should be safe to plug into a normal PCIe slot.

UCSC-MRAID12G-2GB UCSC-MRAID12G-2GB

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    \$\begingroup\$ It does superficially look like a PCIe pinout. The lane pairs visible on the bottom side are on the correct fingers for lanes 4-7, the short fingers on the top side match the PRSNT2 positions and the one short position on the bottom matches PRSNT1. Pic is a bit fuzzy - but it also looks like the +12V pins are connected together as expected. My bet is that it is a PCIe x8. \$\endgroup\$
    – brhans
    Aug 27, 2022 at 2:19
  • \$\begingroup\$ @brhans, see answer. \$\endgroup\$
    – KJ7LNW
    Sep 20, 2022 at 23:47
  • \$\begingroup\$ It looks like they used a regular PCI connector for PCIe here, that's weird. \$\endgroup\$
    – Hearth
    Sep 21, 2022 at 20:54
  • \$\begingroup\$ @Hearth it turns out thats the case. We gave it a shot and it worked! See the link in the answer below for details if you're curious. \$\endgroup\$
    – KJ7LNW
    Sep 21, 2022 at 22:48

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As it turns out, it is a PCIe interface and the extension cable worked. Thanks @brhans for offering the added bit of confidence I needed to try this out!

Here is a Reddit article about the whole project that was spawned by @brhans' comment:

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