Just added a new Crucial P1 500GB NVMe PCIe M.2 SSD to my new Dell G5 15 5505 laptop in the 2nd M2 slot. First I noticed the weird hiccup in performance with this drive - in probably thousands of tests with the ATTO benchmark over the years, I've come to just about always see a steady increase in performance as the transfer size increases - never a bell. So then I tested the original stock SSD, a Samsung P991, and saw the write performance on that one completely tank compared to a pre-upgrade benchmark. The Samsung's poor performance was confirmed using AS-SSD as well (though without a pre-upgrade test for comparison). Any ideas what is going on here?