Within two hours I reinstalled all the drivers and tried once and found the following problem.
1. standby voltage and driver version has no relationship (in the reinstallation of the latest version of the driver my graphics card can maintain a standby voltage of 5w)
ps: not using any power section script
2. unraid in the first boot (all gpu driver versions) graphics card will maintain the memory frequency at very high, voltage is about 40-50w, fan 0 speed.
First I open the console and enter nvtop, the gpu will become standby (memory frequency drops, fan low speed, voltage 17-20w) when I close the unraid console will resume high load, fan 0 speed. Then I try to open the plex to play the video and then close the video, then the gpu will become standby with 5w voltage (idle state).
So when I start unraid every time I have to have a play video operation to keep the gpu in low power idle.
3. about the pcie problem, I just looked at the idle state default pcie gen 1 when there is a program call to the gpu (such as play video) will automatically switch to pcie gen 4