Why is the SSD not giving out full speed?

Question

Iron

It seems that everything is connected correctly, the mother of asus hero vii.

Answer 1

You are testing the disk on which the system is installed.
Of course, it will not show the full speed - it also serves system requests except for your test.
Put the system on another drive, connect the SSD, make sure no one is accessing it and run the test, then you will see the full speed.

Answer 2

because full speed is only under ideal conditions.