220-1101 Hardware Practice Question
A technician builds a high-performance workstation for video editing. The motherboard supports DDR4 RAM up to 3200 MHz, and the CPU's official memory controller supports DDR4 up to 2933 MHz. The technician installs two 16 GB sticks rated at 3600 MHz. The system boots, but the memory speed is only 2133 MHz. The technician has enabled XMP (Extreme Memory Profile) in the BIOS. Which of the following is the MOST likely reason the RAM is not running at its rated speed?
⚠ Common exam trap
Many exam-takers assume the motherboard's supported speed (3200 MHz) is the limiting factor, but the CPU's memory controller is the actual bottleneck when the RAM speed exceeds its native support.
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 CPU's memory controller does not support 3600 MHz natively and may not be stable at that overclocked speed
The CPU's official memory controller supports DDR4 up to 2933 MHz natively. The installed RAM is rated at 3600 MHz, which exceeds this specification. Enabling XMP attempts to overclock the memory beyond the CPU's native support, but the system may fall back to a safe default speed (2133 MHz) if the CPU's integrated memory controller (IMC) cannot reliably handle the overclocked frequency. This is the most likely reason the RAM is running at 2133 MHz instead of its rated speed.
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 CPU's memory controller does not support 3600 MHz natively and may not be stable at that overclocked speed
Why this is correct
Correct. The CPU's memory controller is rated for up to 2933 MHz. Running RAM at 3600 MHz is an overclock that may not be stable on this CPU, causing the system to default to a safe lower speed.
- ✗
The motherboard only supports a maximum memory speed of 2133 MHz
Why it's wrong here
The motherboard is not the limiting factor; its specification list states support for up to 3200 MHz, so it can handle the 2933 MHz native speed and even overclocked frequencies. The true constraint is the CPU's integrated memory controller, which is certified for 2933 MHz and may fail to stabilize the memory at 3600 MHz, causing the system to fall back to a JEDEC-safe speed during memory training.
- ✗
The RAM modules are not fully seated in the slots
Why it's wrong here
Improperly seated RAM typically prevents the system from detecting the module at all, triggering a no-POST condition, beep codes, or a diagnostic LED—not merely a lower operating frequency. Since the system boots and recognizes the full memory capacity, the SPD (Serial Presence Detect) data is being read successfully, which confirms the electrical connection is fully intact. The reported symptom of 'all memory detected but at a reduced speed' points to an IMC or XMP training issue, not a physical installation problem.
- ✗
The power supply unit (PSU) does not provide enough wattage for the high-speed RAM
Why it's wrong here
Power supply wattage has no direct influence on memory clock speed, because the motherboard's voltage regulator module (VRM) takes the 12V input and converts it to the ~1.2–1.35V required by DDR4, independent of the memory controller's frequency setting. An insufficient or failing PSU typically causes system shutdown, freezes, or failure to boot under load, not a deliberate speed downgrade that persists across reboots. Since the system is stable and just runs the RAM at a lower rate, the PSU is demonstrably supplying enough power for the platform.
Go deeper
Related to this question
Learn chapter
RAM Types and Memory Slots
Key term
Dual In-line Memory Module
A Dual In-line Memory Module (DIMM) is a small circuit board that holds memory chips and plugs into a computer's motherboard to provide Random Access Memory (RAM).
Key term
RAM
RAM (Random-Access Memory) is volatile computer memory that temporarily stores data for quick access by the CPU.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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