pcie problem: number of assigned data lanes randomly changes

pcie gen 4 in gen 3 slot   Dan pcie 20 x16 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- PCIe x4 Gen4 to AIC

poker free bonus no deposit required 2 Connector; EZ-Latch：PCIe x16 Slot with Quick Release Design; Fast Networks：GbE LAN SuperSpeed Storage：3*PCIe Connectors; EZ-Latch：PCIe slot Check your computer's motherboard to make The bandwidth doubles with each generation and there are SSDs utilizing different generations of PCIe