12V Regulation and Cross-Load
We have a collection of three other supplies all considered to be firm choices in the 850W range.
12V regulation is more than decent on the 2021 interpretation of the RMx line.
Here's an interesting observation. Some supplies exhibit slight perceivable coil noise when one oscillates between low and high load in quick fashion - we can do this on the Chroma load-tester. The RM850x doesn't suffer from such ails.