@ DTH, Your 5,000mhz second screenshot shows IBT did not complete, your bottom screenshot with IBT successfully completed, only shows a 1900mhz clock in CPU-Z?
To claim 5,000mhz stability you'll need a screenshot at 5,000mhz with IBT successfully completed, and a CPU-Z validation of the 5,000mhz clock.
A CPU-Z validation separately provided does not prove 5,000mhz stability unless it was achieved at the same time the IBT was run, so it should all be on the same screenshot.
Here's a suggestion, If you pull 2 of those memory modules 4 x 4 = 16gb to 2 x 4 = 8gb in your primary slots you may have an easier time stabilizing 5,000mhz clock with 8gb of memory.