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.