3.3 - Given a scenario, install RAM types.

Question 1

What is memory?

Answer 1

Random Access Memory (RAM) is the most common.

But it’s not the only kind of memory.

RAM is not referring to hard drive or SSD storage Don’t mix the two terms.

Data is stored permanently on the drive.
Data and programs can only be used when moved to RAM.

Question 2

SO-DIMM

Answer 2

Small Outline Dual In-line Memory Module.

About half the width as a DIMM.

DDR2, DDR3, and DDR4 SDRAM.

Used in laptops and mobile devices.

Question 3

DIMM

Answer 3

Dual inline memory module.

Electrical contacts are different on each side.

64 bit data width.

Question 4

DRAM

Answer 4

Dynamic Random Access Memory.

The memory on the DIMM.

Dynamic - Needs constant refreshing.
• Without refreshing, the data disappears.

Random access.
• Any storage location can be accessed directly.

• Unlike magnetic tape.

Question 5

SDRAM

Answer 5

Synchronous Dynamic Random Access Memory.

or Synchronous DRAM.

SDRAM is synchronous with the common system clock.

• Queue up one process while waiting for another.
• Classic DRAM didn’t wait for a clock signal.

Question 6

RAM

Answer 6

Random-access memory.

Form of computer memory that can be read and changed in any order, typically used to store working data and machine code.

Question 7

DDR vs SDR

Answer 7

Double Date Rate RAM vs Syncronous Dynamic RAM.

Question 8

DDR2

Answer 8

Double Data Rate 2.

Twice as fast as DDR.

DDR2 will not work in DDR slots.

Question 9

DDR3

Answer 9

Double Data Rate 3.

Twice the data rate of DDR2.
• Larger chip capacities - Maximum 16 GB per DIMM.

• No backwards compatibility.

Question 10

DDR4

Answer 10

Double Date Rate 4.

Speed increases over DDR3.
• Faster frequencies.
• Maximum 64 GB per DIMM.

• Again, no backwards compatibility.

Question 11

Multi-channel memory

Answer 11

Dual-channel, triple-channel, or quad-channel.

• Memory combinations should match.
• Exact matches are best.
• Memory module slots are often coloured differently.

Question 12

Memory that checks itself.

Answer 12

Used on critical computer systems.
VM servers, database servers, any server.

Parity memory
Adds an additional parity bit.

Won’t always detect an error.

Can’t correct an error.

Error Correcting Code (ECC)
Detects errors and corrects on the fly.

Not all systems use ECC.

It looks the same as non-ECC memory.