RAM

Question 1

SDRAM meaning?

Answer 1

Synchronous Dynamic Random Access Memory

Question 2

SDRAM are identified how?

Answer 2

2 notches and 168 pins

Question 3

DDR meaning?

Answer 3

Double Data Rate

Question 4

DDR modules are identified how?

Answer 4

“PC-“ on module and 184 pins

Question 5

DDR2 modules are identified how?

Answer 5

“PC2-“ on the module and 240 Pins

Question 6

DDR3 modules are identified how?

Answer 6

“PC3-“ on the module and 240 pins

Question 7

SO-DIMM modules are identified how?

Answer 7

Shorter for laptop with 204 pins

Question 8

DDR4 modules are identified how?

Answer 8

“PC4-“ on the module and 288 pins

Question 9

What is MT/s

Answer 9

Mega Transfers per Second

The rate at which transfer happen in and out of RAM

Question 10

Given the Clock speed of DDR4 RAM how do you work out the PC rating?

Answer 10

MHz x 8 = PC speed

Question 11

DDR and PC ratings relate to what?

Answer 11

The speed rating of RAM

Question 12

Given the PC rating of DDR4 RAM how would you work out the Clock speed of a module?

Answer 12

PC rating / 8 = MHz speed

Question 13

184 pin module is what class of DDR?

Answer 13

Just DDR

Question 14

240pin module is what class of DDR?

Answer 14

DDR2 or DDR3 which would be identified by the “PC-“ rating of 2 or 3

Question 15

288 pin module is what class of DDR?

Answer 15

DDR4

Question 16

What type of module has 204 pins?

Answer 16

SO-DIMM for laptops.

Question 17

RAM is avilable in single and double sided but what feature does this refer to?

what must be checked?

Answer 17

Chips on one or both sides of the RAM module.

If the motherboard supports it.

Question 18

What are “Channels”?

Answer 18

Specific paired or grouped slots that are optimised together.

Question 19

Dual, Tripple, Quad channel memory allows the system to do what?

Answer 19

Simultaneous access to multiple modules.

Question 20

What is a must be use in order to allow RAM channels to function as designed?

Answer 20

Identical modules that are normally sold in paired/grouped packs.

Question 21

What does SO in “SO-DIMM” mean.

Answer 21

Small Outline, for laptops.

Question 22

What is Parity RAM?

Answer 22

Can detect a singe failure. Cannot correct the failure.

Typically 8 chips.

Question 23

ECC RAM description.

Answer 23

EEC - Error Correction Code.

Can detect multiple failures, typically 2. Can correct a single failure.

Typically 9 chips

Question 24

What type of Ram can detect a singe failure but cannot correct the failure.

Typically 8 chips.

Answer 24

Parity RAM.

Question 25

What type of RAM can detect multiple failures, typically 2 but can only correct a single failure.

Typically 9 chips

Answer 25

ECC (Error Correction Code) RAM description.

Question 26

How many chips can go bad in Parity and ECC RAM?

Answer 26

1 in Parity, 2 in ECC

Question 27

What is an SPD chip?

Answer 27

Serial Presence Detect chip, holds the RAM spec and defaults for the motherboard to detect.

Question 28

What do we check before buying or installing RAM?

Answer 28

Motherboard spec and manual for:

Capacity,

Speed,

Which slots to use for channels,

If Parity or ECC capable.

Question 29

What holds the RAM spec and defaults for the motherboard to detect.

Answer 29

SPD chip, Serial Presence Detect chip.

Question 30

What programs can be used to diagnose RAM?

Answer 30

Windows Memory Diagnostic tool,

MemTest86