3.2 Memory Modules

Question 1

Single Bank

Answer 1

Can put any suze of RAM module in any slot

Question 2

Paired Bank

Answer 2

Requires installation of banks in pair

Question 3

What does DDR stand for?

Answer 3

Dual Data Rate

Question 4

What are the types of DDR RAM?

Answer 4

DDR3
DDR4
DDR5

Question 5

Throughput of RAM is calculated based on…

Answer 5

the bus speed and the width of the data bus

Question 6

Dynamic RAM (DRAM)

Answer 6

Oldest type of memory that requires frequent refresh. The storage cell is dynamic.

Question 7

Synchronous DRAM (SDRAM)

Answer 7

First memory module that operates at the same speed of the motherboard bus

Question 8

Static RAM (SRAM)

Answer 8

Solved the issue of the constant refresh, but was expensive

Question 9

Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM)

Answer 9

Doubles the transfer speed of an SRAM module (184-pin connector)

Question 10

Double Data Rate 2 Synchronous Dynamic Random Access Memory (DDR2 SDRAM)

Answer 10

Higher latency and has faster access to the external bus (240-pin connector)

Question 11

Double Data Rate 3 Synchronous Dynamic Random Access Memory (DDR3 SDRAM)

Answer 11

Runs at a lower voltage and at a higher speed than DDR2 (240 keyed pin connector). Throughput is 6.4 to 17 GB/s with a maximum module size of 8GB per memory module

Question 12

DDR4

Answer 12

12.8 to 25.6 GB/s throughput 32 GB per module

Question 13

DDR5

Answer 13

38.4 to 51.2 GB/s throughput 128 GB per module

Question 14

You should be able to tell what RAM type it is based on the name. Ex. PC4-16000 is…?

Answer 14

DDR4 Module with 16000 MB/s or 16GB/s

Question 15

You should be able to tell what RAM type it is based on the name. Ex. PC5-42000 is…?

Answer 15

DDR5 Module with 42000 MB/s or 42GB/s

Question 16

Small Outline Dual In-line Memory Module (SODIMM)

Answer 16

Still classified as DDR3-5

Question 17

Multi-Channel Memory

Answer 17

Uses two different memory modules to increase the performance and throughput

Question 18

Single-channel Memory

Answer 18

64-bit data bus

Question 19

Dual-channel Memory

Answer 19

128-bit data bus

Question 20

Interleaving….

Answer 20

gives increased performance

Question 21

Single-Channel

Answer 21

Uses one memory module on one bus (64-bit data bus)

Question 22

Dual-Channel

Answer 22

Uses two memory modules and two memory slots in the motherboard (128-bit data bus)

Question 23

Triple-Channel

Answer 23

Uses three memory modules and three memory slots in the motherboard (192-bit data bus)

Question 24

Quad-Channel

Answer 24

Uses four memory modules and four memory slots in the motherboard (256-bit data bus)

Question 25

Non-Parity Memory

Answer 25

Standard memory that does not check for errors and allows data to be put in or taken out

Question 26

Parity Memory

Answer 26

performs basic error checking and ensures the memory contents are reliable, slower than non-parity. Every byte has an associated parity bit which is calculated to determine errors

Question 27

Error Correcting Code (ECC)

Answer 27

Detects and corrects an error, slower than non-parity and parity. Used in high end stations

Question 28

Buffered / Registered Memory

Answer 28

Additional hardware (register) between memory and CPU. The motherboard has to support ECC modules

Question 29

DDR5 has internal error checking for its modules

Answer 29

It is NOT considered an error checking method

Question 30

Virtual Memory

Answer 30

Space on a hard drive that is allocated by the OS and pretends to be memory. It is know as page file (windows) or swap space (Linux Unix/MAC}