Hey guys, I’ve spent whole night and found something from 3 years ago that helped me. Works well even from startup:
nvidia-settings -a GPUGraphicsClockOffsetAllPerformanceLevels=N -a GPUMemoryTransferRateOffsetAllPerformanceLevels=N
Where N = Mhz
Hope that will help somebody. I am on lqx kernel, and aside from that glitch 465 felt choppy. I first downgraded to 455 (nvidia-settings too), but still couldn’t change overclock somehow. But now it works.