Chapter 10: Memory

Question 1

True / False: Memory is expensive?

Answer 1

True

Question 2

In relation of memory, Cache memory is?

Answer 2

Fast, costly, low capacity

Question 3

In relation of memory, Disks are?

Answer 3

Slow, less expensive, high capacity

Question 4

The main memory is?

Answer 4

A compromise between speed, price, and capacity

Question 5

Virtualized machines require how much memory?

Answer 5

2GB

Question 6

Three main memory technologies discussed?

Answer 6

1. DDR
2. DDR2 & DDR3
3. Fully Buffered DIMMs

Question 7

What is DRAM?

Answer 7

Dynamic Random Access Memory

Question 8

What is SDRAM?

Answer 8

Synchronous Dynamic RAM

Question 9

What is DIMM?

Answer 9

Dual Inline Memory Module

Question 10

DRAM capacity is measured in?

Answer 10

Words

Question 11

What DRAM words can be?

Answer 11

1. 4 bits
2. 8 bits
3. 16 bits

Question 12

Capacity of DIMM is the sum of what?

Answer 12

Capacities of the DRAM chips (minus ECC chips)

Question 13

How much data does a “rank” provide?

Answer 13

64 bits

Question 14

SDRAM is synchronous with what?

Answer 14

System Clock

Question 15

Registered DIMMs have what?

Answer 15

A Buffer (register)

Question 16

True / False: Registered DIMMs are faster than unbuffered DIMMs?

Answer 16

False.

Question 17

Using RDIMMs allows for what three operations?

Answer 17

1. Isolation of memory controller from DRAM
2. Lighter electrical load
3. More memory slots

Question 18

DDR memory transmits data on what?

Answer 18

The rising and falling clock tick edge

Question 19

DDR uses a pre-fetch of what size?

Answer 19

2 bits

Question 20

DDR uses what voltages?

Answer 20

2.5 to 2.8 VDC

Question 21

What is the DDR bus clock speed?

Answer 21

200MHz

Question 22

DDR2 operates at what bus clock speeds?

Answer 22

400MHz, 800MHz, 1600MHz (future)

Question 23

DDR2 operates at what voltage?

Answer 23

1.8 VDC

Question 24

DDR DIMMs have how many pins?

Answer 24

184

Question 25

DDR2 DIMMs have how many pins?

Answer 25

240

Question 26

DDR3 voltage is reduced to?

Answer 26

1.5 VDC

Question 27

DDR3 memory bus clock rate is four times what?

Answer 27

The Core Clock

Question 28

How large is a DDR3 pre-fetch?

Answer 28

8 bits

Question 29

In relation of memory, As CPU speeds increase?

Answer 29

Memory access must increase to reduce bottlenecks

Question 30

Define FB-DIMM

Answer 30

Fully buffered DIMM

Question 31

FB-DIMM technology replaces what?

Answer 31

Shared parallel memory channel used in DDR and DDR2 memory controllers

Question 32

Interface at each FB-DIMM is called?

Answer 32

A Advance Memory Buffer (AMB)

Question 33

AMB uses what type of connection to each DIMM?

Answer 33

Serial

Question 34

In relation of memory, As FB-DIMMs are added?

Answer 34

Latency is increased

Question 35

FB-DIMMs allow for what?

Answer 35

Greater scaling and larger memory bandwidth