What I mean is does not matter if you have only one machine. You send your work to the back burner as split scanlines.
First precalculate UHD cahce load from file and send your massive image in split scanlines with backburner in lets just say 15-20 splits.
So you machine will be rendering one line after another . but not the whole massive image in one go. After it will finish renering those lines it will stitch them up.
In this way you will use less memory. But everything will be automatic.
I even use bacburner sending multiplie jobs thro the night. Stacking lets just say 5 cameras to render. And leave it thro the night. It will pick job after job and render it. Run manager server and monitor on the same machine that u use.
Hope this helps.
Best,
Romas