Multi-GPU: How problematic is chipset PCI-E lanes?

I am trying to retro-fit my home server for a bit of AI fun. Happened to acquire one 5060 ti 16gb at a very good price, and now trying to find a partner for it.

The only problem is that my home server wasnt really bought based on PCI-E lanes.

My board has:

PCIE1: 1 × PCIe 5.0 x16 slot, wired for x16 from the CPU. This is the main GPU slot.

PCIE2: 1 × PCIe 4.0 x16-size slot, but electrically only x4, fed by the chipset.

M2_1: PCIe 5.0 x4 from the CPU (currently holds OS drive, but it can be moved)

M2_2: PCIe 4.0 x4 from the chipset

M2_3: PCIe 4.0 x4 from the chipset

Would dual 5060 ti suffer a lot from being PCIE1 + PCIE2? Can/should I get an adapter and use the M2_1 slot? Or should i give up and buy a larger single card instead? (would probably be the Radeon r9700), and just upgrade my sons gaming PC with the 5060ti?

submitted by /u/ziphnor
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