RAM

Question 1

SDRAM

Answer 1

Synchronous DRAM
2 Notches
168 pins

Question 2

DDR-SDRAM

Answer 2

Double Data Rate SDRAM
two bits of data per tick of the clock
single notch
184 pins

Question 3

DDR Speed rating

Answer 3

2x clock speed of MB

Question 4

PC Speed rating

Answer 4

DDR rating x 8

Question 5

DDR2 SDRAM

Answer 5

single notch (offset from DDR-SDRAM)
240 pins
x2 speed of DDR

Question 6

DDR3 SDRAM

Answer 6

2x speed of DDR2
240 pins
single notch (offset from other notches)

Question 7

DDR4 SDRAM

Answer 7

288 pin
single notch (offset from others)
Fastest ram on exam
bandwidth = x8
DDR4 rating = bandwidth
PC speed rating = bandwidth x 8

Question 8

Double sided RAM

Answer 8

Ram modules on both sides of stick

256 MB, 1Gb, 4Gb etc… always x4 steps in capacity

Question 9

Single sided RAM

Answer 9

Ram modules on only one side of stick

512Mb, 2Gb, 8Gb, etc…

Question 10

RAM Channels

Answer 10

Dual-Channel Memory - Same size and speed in two slots (one on each channel)
talk to both sticks at same time due to the channels
Can be different capacities in opposite slots

Question 11

RAM

Answer 11

Random Access Memory
Measured in Bytes
8 bits to a byte (typically 8 modules on a stick)
ECC RAM - sometimes 9 modules, for parity (error correction code)

Question 12

SODIMM

Answer 12

Small Outline Dual In-line Memory Module

Question 13

SPD chip

Answer 13

Serial Presence Detect

Provides computer with info about the RAM - Manufacturer, specs, etc…