NZXT Lexa S - Manual (Page 13)

NZXT. 11
6. Lastly, NZXT recommends users route the hard drive power
cables from the back of the motherboard for better airflow
and wire management
Wire routing and CPU fan bracket removal
The LEXA S is designed to allow for optimal airflow and wire
management inside the chassis, please follow the guidelines below
on how to use the features.
1. Route PSU cables through the bottom opening and use the
punched holes to tie any loose cables