Thanks @PoorlyCreative .  I installed HWiNFO64 and sure enough my m.2 and GPU were sharing the same spot.    Taking the m.2 off the shared PCI slot made a significant difference in m.2 performance, which is funny, because it was actually cutting into...

I too am experiencing slower performance than expected, using Samsung Magician and UserBenchmark to evaluate. To make matters worse, when I updated the SSD firmware to the latest it actually slowed the drive down further.  On firmware 3B2QJXD7 it ave...