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Comp Systems > Memory Technology > Flashcards

Memory Technology Flashcards

1
Q

random access memory

A

hold data and instructions used by the cpu

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2
Q

DRAM

A

dynamic ram- memory modules used on motherboard

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3
Q

Variations of DRAM

A

DIMM- dual inline memory module. small outline DIMM (SO-DIMM)-Laptops. microDIMMS- subnotebook comps. RIMM + SIMM (outdated)

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4
Q

Diiference between DRAMs

A

-data path width each module accommodates. -how data moves from system bus to module

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5
Q

types memory modules

A

288 pin ddr4- fastest dimm, low voltage, can support quad, dual, and single dimm. 240 pin ddr3- supports quad, triple, dual, single dimm. 240p ddr2. supports dual channel or function as single. 184p ddr supports dual or fuctions as single dimm 168p sdram. RIMM 184 pin-

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6
Q

DIMM details

A

64-bit data path. independent pins on opposite sides of the module. older DIMMs- doesnt not perform simultaneously with others. synchronous DRAM- runs syncroniusly with system bus. 2 notches, 168 pins

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7
Q

What is the typical access time for a register?

A

1 nanosecond

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8
Q

What is the typical access time for a cache?

A

2 nanoseconds

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9
Q

What is the typical access time for main memory?

A

10 nanoseconds

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10
Q

What is the typical access time for magnetic disk?

A

10 milliseconds

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11
Q

What is the typical access time for magnetic tape?

A

100 seconds

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12
Q

What is the capacity of a register?

A

<1kb

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13
Q

What is the capacity of main memory?

A

64-512mb

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14
Q

What is the capacity of a cache?

A

1mb

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15
Q

What is the capacity of a magnetic disk?

A

5-50gb

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16
Q

What is the capacity of a magnetic tape?

A

20-100gb

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17
Q

SDRAM

A

Synchronous Dynamic Random Access Memory Runs synchronously with system bus Two notches Uses 168 pins

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18
Q

DIMM has ____ ____ on opposite sides of module

A

independent pins

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19
Q

Double Data Rate

A

also called ddr sdram- two times faster than sdram. ddr2 sdram- faster uses less power. ddr3 sdam- faster ddr2, uses less power. ddr2 and 3- 240 pin-not compatable uses different notches

20
Q

DDR

A

Double Data Rate Twice as fast

21
Q

What factors effect the performance, capacity, and features of DIMMs?

A

Number of channels they use How much RAM is on one DIMM Speed Error checking abilities Buffering

22
Q

DDR3

A

Twice as fast as DDR2, uses less power

23
Q

What does dual channel memory control do?

A

Memory controller communicates with two DIMMs at the same time Doubles memory access speed

24
Q

factors affect capacity, features and performance of DIMMs

A

number of channels they used. how much ram is on one dimm. speed, error detection, buffering

25
Q

quad channeling

A

introduced with intel sandy brings chipset and processor. introduced 8 memory slots

26
Q

setting up for dual channeling

A

pair of dimms in channel must be equally matched: eg speed, size, manufacturers and features

27
Q

setting up for triple dimm channeling

A

3 DIMM slots populated witg 3 matching ddr3 dimms. 4th is empty

28
Q

What DIMMs use dual channels?

A

DDR, DDR2, DDR3 DDR3 also uses triple channel

29
Q

What does dual channel memory control do?

A

Memory controller communicates with two DIMMs at the same time Doubles memory access speed

30
Q

What did the Intel Sandy Bridge chipset and processor introduce?

A

Quad channelling using 8 memory slots The processor can access 4 slots at a time

31
Q

How do you set up dual/triple channeling?

A

Your pair (or set of 3) DIMMs in a channel must be identical in size, speed, and features (it also helps if they’re the same manufacturer).

32
Q

What is DIMM speed measured in?

A

MHz and PC Rating

33
Q

What are the PC Ratings?

A

Total bandwidth between module and CPU: DDR2 usually PC2 DDR3 usually PC3 DDR4 usually PC4

34
Q

What are the steps to installing a DIMM?

A

Pull out supporting arms on the sides of the slot Use notches on DIMM edge connector as a guide Insert DIMM straight down into the slot Ensure supporting arms lock into position

35
Q

If new memory is not recognized try _______

A

Resetting the module

36
Q

What happens if you mix buffered memory with unbuffered memory?

A

It won’t work lol

37
Q

Installing DIMM: Motherboard using DDR3 dual channel DIMMs

A

Install matching DIMMs in 2 blue slots Install matching DIMMs in 2 black slots

38
Q

Installing DIMM: Motherboard using DDR3 triple channel DIMMs

A

Install matching DIMMs in 3 blue slots If 4th spot is populated it reverts to single channelling For dual channeling, install 2 matching DIMMs in blue spots furthest away from processor

39
Q

What are the minimum and maximum RAM requirements for Windows 7/8?

A

Minimum RAM is 2GB Windows 7 64 bit max RAM 16GB Windows 8 64 bit max RAM 128GB

40
Q

What do you have to consider when looking at purchasing memory?

A

Total RAM installed Memory technology used Speed of memory in MHz, PC rating, or ns ECC or non-ECC CL or RL rating Single, dual, triple or quad channeling

41
Q

What are the connectors inside memory slots made of?

A

Tin or gold

42
Q

What types of memory are used in laptops?

A

DDR, DDR3L, DDR3, DDR4, or DDR2 SO-DIMM

43
Q

CAS and RAS

A

Column Access Strobe Row Access Strobe

44
Q

What are column access strobe (CAS) and row access strobe (RAS)?

A

The number of clock cycles it takes to write or read a column or row of data off a memory module. CAS is more common.

45
Q

Fastest memory with lowest voltage requirements?

A

288-pin DDR4 DIMM
Here, have a chart:

Comp Systems (4 decks)

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