Lets see what Kingston says. Your speeds are a little strange, but they seem too high for anything to be broken. While I've never been a fan of RAID-Mode, Intel-RST, (or other Intel VMD solutions) ... it's just the way my XPS-15_9520 came. I kinda wanted to see how well Dell's currently-shipped factory software-preloads are working these days (both the BIOS settings and the pre-installed Dell Apps in Windows-11) . Since it seems to be working fine, I left everything installed and setup as is, and I am just building-up the machine on top of all that. And to my surprise, I just read this: [URL]#M99253 The Intel VMD optimizes the performance of the storage controller by communicating with the NVMe SSD, Intel Processor and RAM and is therefore expected to have a higher read/write speed than using the legacy AHCI ...    
Hello All- I upgraded my Dell 15 9520 (has an i9 processor) - It now has 64 GB RAM from Crucial (4800 CL40). I also upgraded my M.2 NVMe on my Dell XPS 15 9520.  I installed two (2) Kingston 2 TB Fury Renegade M.2 NVMe drives, and added heatsinks on both. The 2 TB Kingston Fury Renegade drives list performance numbers 7300 read, 7000 write, which are pretty impressive. My Dell, however, after running CrystalDiskMark, showed some pretty poor numbers:  5224 Read / 5967 Write. Windows setting was on "Best Performance".  CPU temp was below 50C.  I ran the test on each individual drive, and received similar numbers.  Why is my "Write" speed faster than my "Read" speed? Why are the numbers so low overall -- nowhere near the advertised 7300 / 7000. Also, this is on a clean install of Windows 11 Pro, fully updated, and I also installed and ran Dell Command Update until I had all updates installed. Am I overlooking a setting? A driver? Something else? Any thoughts? Comments? Suggestions? Thank you. Tiny Tech
XPS 15 9520 --M.2 NVMe Upgrade Performance