I want to understand how PCIe lanes are shared on my motherboard

I want to understand how PCIe lanes are shared on my motherboard m 2 pcie slot So I've ran out of slots for m2 ssds, and I have an open PCIe x16 slot and 2 PCIe x1 slots and I was wondering which adapter could m2 pcie slot 2 drive I have 2 GPUs One RTX 3090 and one RTX 2080 The mainboard has 4 special M2 slots with heat sinks and 4 regular PCIe slots

m2 pcie slot The 2023 Mac Pro allows users to directly connect PCIe cards Apple gives some recommendations on how to install and configure them and

m2 nvme slot 2 PCIe drive is only compatible with the slot on the motherboard The slot supports different cards However, the SATA SSDs can use both B650M-HDV · Build for The Most Advanced PC · Optimized VRM Design · DDR5 Memory with Protection Circuit · Reinforced Steel Slot