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220-1201 Practice Question: A client wants to install a new power supply in a…
A client wants to install a new power supply in a custom PC that uses a mini-ITX motherboard inside a compact case. The current PSU is a standard ATX unit, but the client wants to reduce clutter and improve airflow. Which form factor should you recommend?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SFX
SFX (Small Form Factor) power supplies are designed for compact cases and mini-ITX builds, offering smaller dimensions while still providing adequate wattage. ATX PSUs are too large for many small cases. TFX is for slim cases, and EPS is for servers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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ATX (standard)
Why it's wrong here
Standard ATX power supplies, measuring approximately 150mm x 86mm x 140mm, are the most common form factor for full-sized desktop PCs. However, their larger dimensions make them unsuitable for the compact chassis of most mini-ITX systems. Attempting to install an ATX PSU in a mini-ITX case often results in clearance issues, obstructing internal airflow, and potentially preventing the case side panel from closing, thereby compromising cooling efficiency and build integrity.
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SFX
Why this is correct
SFX (Small Form Factor) power supplies are specifically engineered for compact builds, such as those utilizing mini-ITX motherboards. With typical dimensions around 125mm x 63.5mm x 100mm, SFX units are significantly smaller than ATX PSUs, allowing for proper fit and improved internal airflow in space-constrained cases. Despite their reduced size, modern SFX PSUs can deliver substantial wattage, making them ideal for high-performance mini-ITX gaming or workstation systems.
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TFX
Why it's wrong here
TFX (Thin Form Factor) power supplies are characterized by their long and narrow design, typically measuring 85mm x 64mm x 175mm. These units are primarily intended for use in slimline or low-profile desktop cases where vertical space is limited, rather than the cube-like or compact tower designs often associated with mini-ITX. Their specific form factor usually makes them incompatible with standard mini-ITX case mounting points and internal layouts, which are optimized for SFX or sometimes ATX.
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EPS
Why it's wrong here
EPS (Entry-Level Power Supply Specification) refers to a specific power connector, typically an 8-pin (4+4 pin) or 4-pin connector, used to provide dedicated auxiliary power to the CPU on high-end desktop and server motherboards. It is crucial to understand that EPS is a *connector standard* and not a power supply *form factor*. Therefore, it does not describe the physical dimensions or shape of an entire power supply unit, making it an incorrect choice when selecting a PSU based on case compatibility.
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Senior Network & Security Engineer · founder of Courseiva
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