📚 CompTIA A+ Quiz - Chapitre 6 🔄 Revision

Quiz : Memory

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Contexte : Motherboard RAM specifications (used for Questions 1-5): Four DDR4 SDRAM DIMM sockets arranged in two channels, supporting up to 128 GB (32 GB single DIMM capacity) of system memory. Supports DDR4 3200/2933/2667/2400/2133 MHz modules. Supports ECC unbuffered DIMM 1Rx8/2Rx8 modules. Supports non-ECC unbuffered DIMM 1Rx8/2Rx8/1Rx16 modules. Supports extreme memory profile (XMP) modules.

Q1. Of the given features, which would be applicable to this computer? (Choose all that apply.)

Contexte : Motherboard RAM specifications (used for Questions 1-5): Four DDR4 SDRAM DIMM sockets arranged in two channels, supporting up to 128 GB (32 GB single DIMM capacity) of system memory. Supports DDR4 3200/2933/2667/2400/2133 MHz modules. Supports ECC unbuffered DIMM 1Rx8/2Rx8 modules. Supports non-ECC unbuffered DIMM 1Rx8/2Rx8/1Rx16 modules. Supports extreme memory profile (XMP) modules.

Q2. Pretend that this computer has 4 GB of memory installed. Write all combinations of memory population when inserting RAM into the slots.

Contexte : Motherboard RAM specifications (used for Questions 1-5): Four DDR4 SDRAM DIMM sockets arranged in two channels, supporting up to 128 GB (32 GB single DIMM capacity) of system memory. Supports DDR4 3200/2933/2667/2400/2133 MHz modules. Supports ECC unbuffered DIMM 1Rx8/2Rx8 modules. Supports non-ECC unbuffered DIMM 1Rx8/2Rx8/1Rx16 modules. Supports extreme memory profile (XMP) modules.

Q3. The technician who is recommending memory for this motherboard could recommend memory that does not perform error checking.

Contexte : Motherboard RAM specifications (used for Questions 1-5): Four DDR4 SDRAM DIMM sockets arranged in two channels, supporting up to 128 GB (32 GB single DIMM capacity) of system memory. Supports DDR4 3200/2933/2667/2400/2133 MHz modules. Supports ECC unbuffered DIMM 1Rx8/2Rx8 modules. Supports non-ECC unbuffered DIMM 1Rx8/2Rx8/1Rx16 modules. Supports extreme memory profile (XMP) modules.

Q4. What does the statement "four DDR4 SDRAM DIMM sockets arranged in two channels" mean?

Contexte : Motherboard RAM specifications (used for Questions 1-5): Four DDR4 SDRAM DIMM sockets arranged in two channels, supporting up to 128 GB (32 GB single DIMM capacity) of system memory. Supports DDR4 3200/2933/2667/2400/2133 MHz modules. Supports ECC unbuffered DIMM 1Rx8/2Rx8 modules. Supports non-ECC unbuffered DIMM 1Rx8/2Rx8/1Rx16 modules. Supports extreme memory profile (XMP) modules.

Q5. Would there be an issue if this motherboard contained 6 GB of RAM and the computer had 32-bit Windows 10 installed? If so, explain the issue.

Contexte : Memory advertisements (used for Questions 6-11):
a. 2 GB 240-pin SDRAM DDR3L 1600 (PC3L 12800) Desktop Memory
b. 4 GB DDR3-1600 (PC3-12800) CL11 240-pin DIMM
c. 4 GB ECC registered DDR3 SDRAM CAS latency 9
d. 4 GB 240-pin DDR3 SDRAM 1333 (PC3 10600) CAS 9
e. 8 GB (1x8 GB) 1333MHz PC3-10600 CL9 ECC registered dual-rank low power
f. 8 GB (2x4 GB) DDR4 SDRAM 2133 (PC4 17000)
g. 16 GB PC4L-2666
h. 16 GB kit (2x8 GB) DDR4 2666 MHz PC4-21300 CL19 unbuffered non-ECC 1.2V UDIMM
i. 16 GB 1Rx16 DDR4 UDIMM 3200MHz

Q6. In these advertisements, which DDR4 option(s) would hold the most data in a single memory module and be best suited for a desktop computer?

Contexte : Memory advertisements (used for Questions 6-11):
a. 2 GB 240-pin SDRAM DDR3L 1600 (PC3L 12800) Desktop Memory
b. 4 GB DDR3-1600 (PC3-12800) CL11 240-pin DIMM
c. 4 GB ECC registered DDR3 SDRAM CAS latency 9
d. 4 GB 240-pin DDR3 SDRAM 1333 (PC3 10600) CAS 9
e. 8 GB (1x8 GB) 1333MHz PC3-10600 CL9 ECC registered dual-rank low power
f. 8 GB (2x4 GB) DDR4 SDRAM 2133 (PC4 17000)
g. 16 GB PC4L-2666
h. 16 GB kit (2x8 GB) DDR4 2666 MHz PC4-21300 CL19 unbuffered non-ECC 1.2V UDIMM
i. 16 GB 1Rx16 DDR4 UDIMM 3200MHz

Q7. In option g, what does the L in DDR4L mean?

Contexte : A customer wants to dual-channel 8 GB of RAM on a desktop computer. Motherboard documentation says: do not install ECC memory modules; memory configurations are a pair of matched modules in DIMM connectors 1 and 2, OR a pair in 1 and 2 plus another pair in 3 and 4; if you install mixed pairs, all memory runs at the speed of the slowest module installed. (Memory slots are in order from closest to the CPU: 1, 3, 2, 4.)

Q8. Which memory module(s) would be best to buy, given this documentation?

Contexte : Same scenario as the previous question: a customer wants to dual-channel 8 GB total, buying one matched pair of modules.

Q9. Considering the answer given to the previous question, which motherboard DIMM connectors would be used?

Q10. What type of memory feature will be needed if data accuracy is paramount for a new computer?

Contexte : Memory advertisements (used for Questions 6-11):
a. 2 GB 240-pin SDRAM DDR3L 1600 (PC3L 12800) Desktop Memory
b. 4 GB DDR3-1600 (PC3-12800) CL11 240-pin DIMM
c. 4 GB ECC registered DDR3 SDRAM CAS latency 9
d. 4 GB 240-pin DDR3 SDRAM 1333 (PC3 10600) CAS 9
e. 8 GB (1x8 GB) 1333MHz PC3-10600 CL9 ECC registered dual-rank low power
f. 8 GB (2x4 GB) DDR4 SDRAM 2133 (PC4 17000)
g. 16 GB PC4L-2666
h. 16 GB kit (2x8 GB) DDR4 2666 MHz PC4-21300 CL19 unbuffered non-ECC 1.2V UDIMM
i. 16 GB 1Rx16 DDR4 UDIMM 3200MHz

Q11. When comparing options b and d and imagining that both modules cost the same, which one would be the better purchase? Explain your reasoning.

Q12. What method is most effective for preventing an ESD event when installing RAM?

Q13. Which of the following would be the first sign that a computer needs more RAM?

Q14. How can you tell the maximum amount of memory a motherboard can support?

Q15. What is one easy way to tell how much RAM is installed in a computer?

Q16. A DDR4 DIMM can fit in a DDR3 memory expansion slot.

Q17. You have just added two new memory modules to a computer, but now the system will not boot and is beeping multiple times. What will you check first?

Q18. Give an example of how a technician might project confidence while working on a help desk.

Q19. A system already has two 3200 MHz memory modules installed, and a technician adds two more modules that operate at 4800 MHz. What will be the result of this action?

Q20. A technician has received a complaint that a computer is not performing as well as it used to. Which Windows tool would the technician ask the user to open to quickly tell how much RAM is currently being used by the open applications?