A+ RAM compatibility: DIMM, SODIMM and ECC
A memory upgrade must match more than a capacity number. Check form factor, memory generation, supported capacity, and the platform requirements. ECC capability requires compatible memory and platform support. Follow the motherboard slot arrangement for multichannel operation. A module that looks similar may have a different notch or electrical specification and should never be forced into place.
How to read the scenario
When a machine fails immediately after an upgrade, check seating and compatibility before assuming the original operating system is damaged.
Identify the required outcome, the evidence already provided, and the limits on the technician’s action. Compare every option against those details before deciding. Record why the closest alternative does not meet the stated need.
Original practice example
A service manual calls for a compact replaceable memory module used in a laptop. Which listed form factor fits?
- DIMM
- ECC memory
- SODIMM
- Dual-channel memory
Show the answer and explanation
SODIMM
SODIMMs are smaller memory modules commonly used in serviceable laptops and compact systems.
Study questions
Which objective does this guide support?
220-1201, objective 3.3. This independent guide supports original practice and does not replace the full official objectives.
What should I watch for in a scenario?
When a machine fails immediately after an upgrade, check seating and compatibility before assuming the original operating system is damaged.
Source and version
CompTIA official 220-1201 objectives, objective 3.3. Verified November 5, 2026. Use the exam code when choosing study materials; similarly named certifications can have different objectives.