pcie problem: number of assigned data lanes randomly changes

pcie gen 4 in gen 3 slot   Dan pcie 30 x4 slot

PCIe has retro-compatibility, that's for the X16 slot you use for the GPU and the M possibly SATA controlled

Slot power · x1 cards are limited to A at +12 V and 10 W combined · x4 and wider cards are limited to A at +12 V and 25 W combined · A full- The following image shows the PCI connections of the motherboard used in DuroPC's IMB540-4 Notice 'SLOT 13' are PCIe x16 slots but only Slot 3 has an x8

phoenix paradise slot 2 x16 Gen 4 Card uses PCIe , which doubles the bandwidth per lane compared to PCIe With four slots, it offers up to 256 Gbps of bandwidth per card, Crucial T705 PCIe Gen 5 NVME SSD, 14,500 MBs, 12,700 MBs Crucial T700 2 slots where at least one supports PCIe, it's worth considering your secondary