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220-1201 Practice Question: A technician is building a new gaming PC and…
A technician is building a new gaming PC and installs two 16 GB DDR5-5600 modules in the correct slots. The system boots and shows 32 GB in the BIOS, but the memory speed is reported as 4800 MHz instead of 5600 MHz. What is the most likely reason for this?
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
✓
XMP or EXPO has not been enabled in the BIOS.
DDR5 modules default to a standard JEDEC speed (often 4800 MHz) for stability. To achieve the rated 5600 MHz, the user must enable XMP (Intel) or EXPO (AMD) in the BIOS, which applies the manufacturer's overclocking profile. This tests knowledge of memory speed configuration beyond plug-and-play.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The RAM modules are defective and cannot run at their rated speed.
Why it's wrong here
Defective RAM modules typically manifest as critical system instability, such as frequent crashes, blue screens of death (BSODs), or memory errors during the Power-On Self-Test (POST) phase. While a system might attempt to run defective RAM at a lower speed to achieve some stability, the primary symptom is usually outright failure or severe unreliability, not merely operating below its rated speed without other issues.
- ✗
The motherboard does not support DDR5-5600.
Why it's wrong here
If a motherboard genuinely lacked support for DDR5-5600, it would either fail to boot entirely or automatically downclock the installed RAM to the highest JEDEC (Joint Electron Device Engineering Council) standard speed it *does* support, which is often significantly lower than the advertised XMP/EXPO profile. While this results in lower speed, the underlying issue is a fundamental hardware incompatibility, not a configuration oversight that can be easily resolved in the BIOS.
- ✓
XMP or EXPO has not been enabled in the BIOS.
Why this is correct
Modern high-speed RAM modules, such as DDR5-5600, are designed to operate at a conservative JEDEC (Joint Electron Device Engineering Council) standard speed by default, typically DDR5-4800 or DDR5-5200. To achieve their advertised higher speeds, users must manually enable an Extreme Memory Profile (XMP) for Intel systems or an Extended Profiles for Overclocking (EXPO) for AMD systems within the UEFI/BIOS. These profiles contain the manufacturer's validated overclocked settings for speed, timings, and voltage, allowing the RAM to perform at its full potential.
- ✗
The RAM is installed in the wrong slots.
Why it's wrong here
Incorrect RAM slot population primarily impacts the memory subsystem's ability to operate in dual-channel or quad-channel mode, which significantly reduces the overall memory bandwidth available to the CPU. While this can degrade performance, it typically does not alter the fundamental clock speed at which the RAM modules themselves are operating. In severe cases, populating slots incorrectly might even prevent the system from booting, rather than just running at a lower speed.
Go deeper
Related to this question
Learn chapter
Network Configuration: IP, DNS, DHCP
Key term
BIOS
BIOS (Basic Input/Output System) is the low-level firmware stored on a motherboard chip that initializes and tests hardware components before loading the operating system.
Key term
Double Data Rate
Double Data Rate (DDR) is a technology that doubles the data transfer rate of a memory or bus by sending data on both the rising and falling edges of the clock signal, effectively doing twice as much work per clock cycle.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.