Hi,
thanks for this topic.
I felt stupid when my dell T20 got power thirsty in idle mode after plugging in an M.2 SSD (with a passive PCIE adaptercard).
Seems like the Lexar NM620 2TB is one of those drivers, that keep the cpu package above C3 level.
With this SSD plugged in, the XEON can't get below C2 anymore. Unplugging the Lexar and it can reach C6 - swapping to a Samsung 970 EVO Plus and C6 is back again.
Trying the Lexar NM620 in a thinkcentre M900 Tiny with I5 6500T show the same "defect by design". Nothing else than C2 reachable. With the 970 the 6500T gets down to C8.
Idling on 4.6W vs. 7W....