A modular power supply unit (PSU) is designed to allow the builder to attach only the cables that are necessary for the specific components being used. This is in contrast to non-modular PSUs, where all possible cables are permanently attached, leading to a clutter of unused cables within the case. By using a modular PSU, a technician can significantly reduce the number of internal cables, which improves case aesthetics and can also enhance airflow by removing obstructions. This directly addresses the requirement to minimize visible internal cables.

A. SATA drive connections: These connections require separate power and data cables for each drive, thereby increasing the total number of internal cables.

B. Liquid cooling: All-in-one (AIO) or custom liquid cooling systems often introduce more cables for pumps, radiator fans, and RGB controllers compared to a standard air cooler.

D. Wireless NIC: This component reduces the need for an external Ethernet cable but does not affect the number of internal cables within the PC chassis.

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1. Intel Corporation. (April 2022). Single Rail Power Supply ATX12VO Design Guide

Version 2.0. Page 11

Section 3.2

"Connectors". The guide details the various power connectors. Modular PSUs provide flexibility by allowing a system builder to select only the required cable harnesses from this set

minimizing unused internal cables.

2. University of Washington

Paul G. Allen School of Computer Science & Engineering. CSE 371: Design of Digital Circuits and Systems - Lab 3: Building a PC. Course materials often describe the selection of components for custom PC builds. In discussions on power supplies

the guide notes the distinction between modular and non-modular types

emphasizing that modular PSUs are preferred for cable management and creating a "clean build" by omitting unnecessary cables.

3. Corsair. (n.d.). PSU 101: A-Z of Power Supplies. Official Vendor Blog. In the section discussing "Fully Modular" PSUs

the documentation states

"Fully modular PSUs are the gold standard... you only need to use the cables your system requires

making for a much tidier build with better airflow." This directly supports the use of modular PSUs for minimizing internal cables.