Concern About New Drive

I bought a new SN750x today but I am concerned about whether or not my drive could have an issue. I already updated the firmware. Is there something else I can do to achieve a close read and write as indicated on the box? Could it be because I am using a Gen 4 SSD on a Gen 3 slot cause the issue? Any help would be appreciated.

Crystal benchmark this is one of the many available.
There is no software benchmark this be considered today as industry standard = 100% trusted.
All measurements contain mathematical Error factor.
If measurement results, they are +5% and or -5% that your comparison target, then the hardware (HDD/SSD) it does PASS this evaluation.