- A
The new RAM is not seated properly
Why wrong: If the RAM were not seated properly, the system would likely not boot or would beep; it would not show 8GB as if only the original sticks were detected.
- B
The motherboard does not support four sticks of RAM
Why wrong: Most modern motherboards with four slots support four sticks, though they may run at lower speeds; this is unlikely to prevent detection of the new sticks.
- C
The new RAM is incompatible with the existing RAM
Mismatched RAM modules can cause the system to only recognize the original pair, as the motherboard may fail to train all four modules together.
- D
The BIOS needs an update to support higher capacity
Why wrong: A BIOS update might be needed for very large capacities, but 16GB is standard and should be supported without an update.
Why Does My System Only See 8GB After Adding More RAM?
This 220-1201 practice question tests your understanding of motherboard. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A technician is tasked with upgrading the RAM in a desktop motherboard that has four DIMM slots. The existing configuration has two 4GB sticks in slots A1 and B1. The user wants to add two more 4GB sticks for a total of 16GB. After installing the new sticks in slots A2 and B2, the system boots but only shows 8GB of RAM. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Quick Answer
The answer is that the new RAM is incompatible with the existing RAM, even though both sets are 4GB sticks. This is the most likely cause because when mixing RAM modules, differences in timings, speeds, or ranks can prevent the motherboard from properly recognizing all modules, often defaulting to the lowest common denominator or simply ignoring the mismatched sticks. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of memory compatibility and the importance of using matched kits—a common trap is assuming identical capacity guarantees compatibility. Remember the memory tip: “Same size doesn’t mean same speed; mismatched timings can leave your RAM unread.”
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
The new RAM is incompatible with the existing RAM
When mixing RAM modules, even if they are the same size, they may not be compatible if they have different timings, speeds, or ranks. The motherboard may default to the lowest common denominator or fail to recognize mismatched modules. This is a common issue when not using matched kits.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 new RAM is not seated properly
Why it's wrong here
If the RAM were not seated properly, the system would likely not boot or would beep; it would not show 8GB as if only the original sticks were detected.
- ✗
The motherboard does not support four sticks of RAM
Why it's wrong here
Most modern motherboards with four slots support four sticks, though they may run at lower speeds; this is unlikely to prevent detection of the new sticks.
- ✓
The new RAM is incompatible with the existing RAM
Why this is correct
Mismatched RAM modules can cause the system to only recognize the original pair, as the motherboard may fail to train all four modules together.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The BIOS needs an update to support higher capacity
Why it's wrong here
A BIOS update might be needed for very large capacities, but 16GB is standard and should be supported without an update.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
If the RAM were not seated properly, the system would likely not boot or would beep; it would not show 8GB as if only the original sticks were detected.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
Motherboard — study guide chapter
Learn the concepts, then practise the questions
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Motherboard practice questions
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Motherboard — This question tests Motherboard — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The new RAM is incompatible with the existing RAM — When mixing RAM modules, even if they are the same size, they may not be compatible if they have different timings, speeds, or ranks. The motherboard may default to the lowest common denominator or fail to recognize mismatched modules. This is a common issue when not using matched kits.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 18, 2026
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.
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