I have a PC with Ubuntu server installed and Nvidia GPUs attached. I have Googled on and off for a while trying to learn how to overclock the GPUs without success.
Finally, after gleaning bits and parts from different sources, I got power limit and overclocking working.
Here are the steps required
Virtual Monitor #
nvidia-settings need a monitor attached in order to work. For headless linux, one needs a virtual monitor. After messing with xorg conf manually for a while, I found and forked andyljones/coolgpus to automatically attach a virtual monitor for each GPU.

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