Can I install PCIe x8 expansion card in a PCIe x4 slot on a QNAP NAS

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I'm new to MellanoxNVIDIA and am interested in MCX515A-CCAT As a 100 GbE card, I realize this card would need PCIe x16 to reach its

I was told by tech support that the motherboard has 2 PCIe x16 slots and that they run at x8 speed I found this out when i was inquiring as to It means it's a physical x16 slot and will take any size PCIe card, but it's only wired to x8

spartacus slot Situation with a Mellanox X3 10GB network card I have a PCIe slot working on 4 lanes The duo Mellanox card uses a 3pcs 98pin PCIe X8 Socket for Desktop Motherboard Slot Pin number: 98pin Quantity: 3pcs