220-1101 Hardware Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  Enable XMP (Extreme Memory Profile) in the BIOS

  Why it's wrong here

  Enable XMP (Extreme Memory Profile) in the BIOS: XMP loads factory-validated overclocking profiles that adjust the memory multiplier, timings, and voltage to run the module at its rated speed, but it does not alter the physical routing of the memory bus or the channel assignment of populated slots. Channel mode is determined entirely by which DIMM slots are occupied relative to the memory controller's channel topology — a dual-channel board has separate independent channels, and switching from one to two channels requires a module physically present in a slot on the second channel. Since XMP only modifies operating parameters of the memory already installed, it cannot merge two modules in the same channel into dual-channel operation.

• ✓

  Move one of the RAM modules to slot 3

  Why this is correct

  Move one of the RAM modules to slot 3: On a typical four-slot dual-channel motherboard, slots 1 and 2 belong to channel A while slots 3 and 4 belong to channel B; installing both modules in slots 1 and 2 forces the memory controller to run single-channel, using only one 64-bit data bus. By moving one module to slot 3, you end up with one DIMM in channel A (slot 1) and one in channel B (slot 3), allowing the memory controller to activate interleaved dual-channel mode. This restores the full 128-bit effective bandwidth, which is exactly the symptom the user is experiencing after adding a second module.

• ✗

  Replace both modules with single-rank modules

  Why it's wrong here

  Replace both modules with single-rank modules: A memory rank is a set of DRAM chips that share the same data bus and chip-select lines; single-rank modules have one such set, dual-rank have two, and this affects rank-to-rank interleaving and bank conflicts within a single channel, but it has no bearing on how many channels are utilized. The number of channels activated is dictated by the memory controller's detection of which DIMM slots physically have modules, not by the rank count of those modules. If both modules remain in slots 1 and 2, replacing them with single-rank versions still leaves both on channel A, so the system will continue to operate in single-channel mode.

  When this WOULD be correct

  If the motherboard requires single-rank modules for dual-channel operation or if the installed dual-rank modules are causing instability or reduced performance due to rank limitations (e.g., older chipsets with limited rank support), replacing them with single-rank modules would be correct.

• ✗

  Increase the memory voltage in the BIOS

  Why it's wrong here

  Increase the memory voltage in the BIOS: Raising DRAM voltage (VDD) provides additional power headroom to improve signal integrity at high frequencies or tighten timings, but it is a purely electrical parameter that does not interact with the memory controller's channel mapping. The channel configuration is determined during memory training by the controller enumerating which slots have DIMMs; no voltage setting can convince it to use a channel with no memory installed. Since the problem is physical slot population across channels, voltage adjustment is irrelevant and will not restore the missing memory bandwidth.

  When this WOULD be correct

  A technician installs memory that fails to run at its rated speed (e.g., 3200 MHz) and the system defaults to a lower speed. Enabling XMP or increasing voltage slightly could help achieve the rated speed, but voltage increase alone is rarely the first step.

Option-by-option analysis

Why each answer is right or wrong

Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 220-1101 exam frequently reuses these exact scenarios with slightly different constraints.

Analysis generated from the official 220-1101blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”

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