They are running the in-house samples with 3080s and 3090s, and according to reports, Half Life Alyx does full frame rate at least.
Pimax 5K Plus was dealing with many early issues since this was the start of the wide FOV era and Pimax first attempt for a new design and components/modules, so many things went wrong initially. Today, the 8KX blows away most people. You should try it. As a Pimax owner, you also get the price you paid deducted from the price of 12K. So if you have a 8KX and purchased it for 1299 (at any point), you get the 12K for 1100 only.
From CES 2020:
