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It doesn't happen with Redshift, or other GPU usage. Only Octane.

Update....it's the UPS battery backup unit that's making a long, continuous beep when I use Octane. What is that telling me?

I might just be wrong, but I believe Your UPS is too small, not enough power =) so it makes sound nforming that it is stressed, but You have to look at manual what does these sounds really mean =)