Read your own memory configuration and find out whether it is dual channel

short · 40 min · Objective 3.1

Task

Determine exactly what memory is fitted, in which slots, at what speed, and whether the population is actually giving you dual channel -- which a surprising number of machines are not, silently.

Steps

  1. Record every fitted module in lab/ram/modules.csv with header slot,capacity_gb,generation,rated_speed,running_speed,manufacturer.
  2. Record the board's or laptop's maximum supported capacity and generation in lab/ram/board.csv with header field,value,source.
  3. Determine whether the machine is running in single, dual or higher channel mode, and record the evidence -- the reported channel mode or a measured bandwidth figure -- in lab/ram/channels.md.
  4. Where the running speed is below the rated speed, record in lab/ram/speed.md whether a memory profile is available and disabled, and whether the board's maximum explains it.
  5. Write lab/ram/upgrade.md: state whether this machine can take more memory, how much, what it would cost, and what the population rule would be. Where the memory is soldered, say so and cite the source.

Verify

awk -F, 'NR>1 && NF>=6 {n++} END {print n" module(s)"}' lab/ram/modules.csv
awk -F, 'NR>1 {print $2}' lab/ram/modules.csv | sort -u | wc -l
awk -F, 'NR>1 && NF>=3 {n++} END {print n" board field(s)"}' lab/ram/board.csv
grep -Eic 'single|dual|quad' lab/ram/channels.md
grep -c . lab/ram/upgrade.md

Every fitted module recorded with six fields, the board's limits sourced, a channel mode stated with evidence, and an upgrade assessment. A machine with two identical modules reported as single channel is a real finding: the slots are wrong, and the fix is free.

Notes

The channel finding is the one that pays immediately. Moving two modules into the correct alternate slots costs nothing and is measurable, and machines ship populated wrongly more often than anyone expects.

This is an independent study companion for CompTIA A+ Core 1 220-1201 and is not produced by or endorsed by CompTIA.