PCIe GEN 3 slot with PCIe gen 2 controller causing anomalous

can i use pcie 3 0 in 2 0 slot   Dan can you connect pcie 40 in 30 slot

Yes, the second slot is expected to run on two lanes as mentioned in the product specifications Storage Slot RTX 3060 model:

You've got x4 slots, the SSD you've mentioned will work in any of them Permalink  2 connector include PCI Express and newer, Serial ATA 2 slots on motherboards and other devices do not support all SSD

pg+slot+wallet PCIE X4 has 2000 MBs of bandwidth available, but version has more overhead than Update to the latest BIOS and set up PCIe bifurcation settings before using the NVMe RAID function 2 slots — supporting both PCIe and — that allow