refresh rate.

That article provides some good information. Unfortunately, it is plagiarized directly from the Apple article the original poster linked in with, and does not provide attribution to the source, this apple article:

Use multiple displays with your Mac Pro (Late 2013) - Apple Support

.

I don't fault you for this -- that's the best readily-available information. I fault the blog producer for not citing their sources.

That Apple article used to be on page 1 of the search, but something happens to them when they are deprecated or massively revised that moves them off page 1. [Maybe Apple renumbers them?]

Hello, try checking this article: https://www.sewelltech.com/mac-pro-2013-tech-series-part-4/

Hey Grant.

I am sorry about that, when I wrote OP’s question into Google, Apple official article wasn’t on the first page so I chose this one. I will be more careful next time though.