If DRAM clockspeed influences your application or not I don't know -- maybe you don't know too since you never tested it? In case it has a benchmark mode, adjust DRAM clockspeed and re-test
That's a good point. I suspected it did, but wasn't sure. I tested it as you suggested and indeed it does-- the engine does have a benchmark mode.
The h3consumption utility seems to work well. I disabled hdmi, usb, and reduced cores to 2, all without issue. I can't measure actual consumption though. The only indicator is I can look at the trends in armbianmonitor to see if there's improvement.
Also, I got an error when trying to lower DRAM settings. It seemed to work, as evidenced by the speed reduction on the benchmark test, however there was no /etc/armbian-release, spitting out an error. It seems I'm still running 5.11. heh. I'm not anxious to update, but the next release I will make myself do it, since I suspect the one I'm running has that awful allwinner root exploit. Actually... I guess waiting doesn't really matter since after 5.15? apt-get upgrade is all one needs to do. My issue is using a fresh image, but no way around that. It's just I have it working nicely already.