FC0-U71 Infrastructure Practice Question
A technician is installing RAM in a desktop computer. The motherboard supports dual-channel memory. Which memory configuration will provide the BEST performance?
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
✓
Two 8 GB DDR4 modules in matching slots for dual-channel
Dual-channel memory requires two identical memory modules installed in matching slots to double the memory bandwidth.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
One 8 GB and one 4 GB DDR4 module
Why it's wrong here
Mismatched capacities across channels force asymmetric or flex mode, where only the matched portion interleaves, reducing effective bandwidth. Identical modules per channel are required for full dual-channel operation. Mixed sizes suit incremental upgrades where performance is secondary.
- ✓
Two 8 GB DDR4 modules in matching slots for dual-channel
Why this is correct
Dual-channel mode requires matched modules in the paired slots, letting the memory controller interleave two 64-bit channels into a 128-bit aggregate path. Two identical 8 GB DDR4 modules therefore double theoretical bandwidth versus a single module, satisfying the best-performance constraint.
- ✗
Two 8 GB DDR4 modules in the same channel
Why it's wrong here
Both modules occupying one channel leaves the second channel empty, so the controller cannot interleave and operates single-channel. Dual-channel requires one module per channel. Same-channel pairs suit capacity expansion where channel interleaving is not the goal.
- ✗
One 16 GB DDR4 module
Why it's wrong here
One 16 GB module populates only a single memory channel, so the memory controller cannot interleave accesses across two channels, halving theoretical bandwidth. It is tempting because a single large module is a valid, working configuration and is the right pick when only one slot is free or when maximising capacity per slot matters.
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Same concept, more angles
1 more way this is tested on FC0-U71
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A technician is upgrading a desktop computer's memory. Which component would the technician most likely replace to improve system performance using dual-channel architecture?
easy- A.GPU
- B.Storage drive
- C.CPU
- ✓ D.RAM
Why D: RAM is correct because dual-channel architecture requires installing memory modules in matched pairs in specific slots on the motherboard, which doubles the memory bandwidth. Upgrading RAM by adding a second matching module enables dual-channel operation, improving system performance for memory-intensive tasks. The question asks which component to replace to improve performance using dual-channel architecture, and RAM is the only component that directly relates to dual-channel memory.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 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 FC0-U71 exam.