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2nd Graphics card missing... Linux

So i have a vega 64 and 1060 im trying to set up for pass through… my only issue is… 1060 does not show up… there are no pcie choices in the motherboard which is strange asrock pro… and card does fire and video works…

lspci without the grep, the word controller isnt guaranteed to be there.

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still doesnt show… im starting to think its a motherboard thing… im going to have to google more…

first slot is pcie x16 and 2nd is x4… which in bios give m the option for 1 x 16 or 2 x 8…
board: https://www.amazon.com/gp/product/B06WWF165R/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

thanks @wendell

do you have an nvme installed? the second slot is wired to the cpu. (looks like yes, samsung nvme?)

the bios option for 2x8 will require a riser card to split the x16 slot but… on b450… that’s a bit sketchy. it cannnnn sorta work (unofficially) but technically b450 is not supposed to do this.

the second x16 slot’s x4 lanes are wired to nvme OR slot. Can’t use both though.

you can move the m.2 to the other nvme slot (chipset lanes, loss of throughput though i/o latency isnt affected much)

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makes sense…

currently have -
1x evo nvme on x4
pcie - vega
pcie - gtx 1060
1x older intel m.2 on x4 right under gtx…