Arcade machine power supplies and PC power supply units (PSUs) serve similar functions but are designed for very different environments and requirements. Here are the key differences:

1. Voltage Regulation: Arcade power supplies often provide multiple voltage outputs (e.g., +5V, +12V, -5V) tailored for arcade PCBs and CRT monitors, while PC PSUs focus on stable +12V, +5V, and +3.3V rails for modern components.

2. Form Factor: Arcade PSUs are typically open-frame or enclosed in metal cases for easy mounting in cabinets, whereas PC PSUs follow standardized ATX or SFX sizes.

3. Reliability & Durability: Arcade PSUs are built for continuous operation in commercial settings, while PC PSUs prioritize energy efficiency and modularity for home use.

4. Connectors: Arcade PSUs use screw terminals or JAMMA-compatible connectors, while PC PSUs rely on Molex, SATA, and PCIe connectors.

5. Cooling & Noise: Arcade PSUs often lack active cooling, relying on passive heat dissipation, while PC PSUs include fans for thermal management.

Understanding these differences ensures the right power solution for arcade restoration or PC gaming builds.