Power and Cooling for A+

Scope and topic boundaries

5 lessons in this topic

PSU Input, Output & Rails

Recognize the basic PSU input ranges and output rails CompTIA expects and apply that knowledge in straightforward support scenarios.

PSU Connectors & Types

Identify the main motherboard power connector and distinguish modular and redundant PSU designs by purpose.

Wattage & Efficiency Selection

Choose an appropriate PSU by reasoning about wattage and efficiency without drifting into electrical-engineering detail.

Cooling Components & Roles

Recognize common cooling components and explain their support-level role in moving or transferring heat.

Airflow & Thermal Install Logic

Apply fan, airflow, and thermal-installation logic in straightforward support scenarios involving heat and temperature management.

Common mistakes to avoid

- Confusing VAC (AC input) with DC rails. VAC values describe wall power; rails are DC outputs. Do not mix them when determining compatibility. - Assuming all PSUs auto-switch between 110-120 and 220-240 VAC.

- Confusing connector shapes: the 20+4 main connector is large; the CPU 4/8-pin connectors are separate and smaller. - Assuming modular PSUs are inherently higher quality; modularity is about cable routing, not necessarily electrical specs.

- Relying solely on a large wattage label (e.g., 1000W) without checking efficiency or rail ratings; a high-wattage, low-efficiency PSU can be a poor choice.

- Believing bigger fans always cool better; airflow direction, static pressure, and mounting location affect real-world cooling. - Over-application of thermal paste expecting improved cooling; proper thin layer is sufficient.