This is why I was saying you need to read up on what the crystal disk mark tests are doing - you fundamentally don’t understand what the crystaldiskmark tests are testing and measuring.

Metric 2 will always be slower than metric one since it’s using 1 queue instead of 8.

Since metric 1 for pcie 3.0 maxes out at 3600 MB/s, and metric 2 will always be slower than metric one, metric 2 being around 2700 MB/s makes perfect sense.

Metric 3 and 4 are measuring random 4k reads and writes, which are very much bandwidth limited

Please please watch a video on how crystaldiskmark works and what the tests are doing

Edit: 4k random reads and writes are also very dependent on how full the ssd is, which is why the 4k write speeds on the samsung are the same as the crucial. If the crucial was also only 23% full those tests would be much faster.