Prelims - Introduction to Random Access Memory

Question 1

is the hardware in a computing device that provides temporary storage for the operating system (OS)

Answer 1

Random access memory (RAM)

Question 2

Types of RAM

Answer 2

Dynamic random access memory (DRAM)

Static random access memory (SRAM)

Question 3

is typically used for a computer’s main memory, it needs continuous power to retain stored data. offers a higher density, but it produces more heat, consumes morepower

Answer 3

DRAM

Question 4

is typically used for the system’s high speed cache, such as L1 or L2. doesn’t need to be continually refreshed. has a lower density, but it produces less heat, consumes less power and offers better performance

Answer 4

SRAM

Question 5

Is a type of DRAM that synchronizes with the system clock, allowing for faster and more efficient data transfer compared to conventional DRAM.

Answer 5

SDRAM

Question 6

Types of SDRAM

Answer 6

SDR SDRAM (Single Data Rate SDRAM)

DDR SDRAM (Double Data Rate SDRAM)

DDR2 SDRAM

DDR3 SDRAM

DDR4 SDRAM

DDR5 SDRAM

Mobile SDRAM (LPDDR Series)

Question 7

transfers data once per clock cycle (on the rising edge), which was standard in earlier computing systems.

Speed: 66-133 Mhz
Voltage: 3.3V
Introduced: Mid-1990s

Answer 7

SDR

Question 8

transfers data on both the rising and falling edges of the clock cycle, effectively doubling the data transfer rate

Voltage: 2.5V
Introduced: 2000

Speed: 200-400 Mhz

Answer 8

DDR

Question 9

increased the data rate and lowering power consumption,but at the cost of slightly higher latency, 4-bit buffer size

Speed: 400-1066 Mhz
Voltage: 1.8V
2003

Answer 9

DDR2

Question 10

increased data transfer rates and reduced power consumption further, with an improved prefetch buffer size (8-bit buffer size)

Speed: 800-2133 Mhz
Voltage: 1.5V
Introduced: 2007

Answer 10

DDR3

Question 11

offers higher data transfer rates, greater memory density, and lower power consumption.It also improves efficiency with an enhanced prefetch buffer and memory bandwidth

Speed: 1600-3200+ Mhz
Voltage: 1.2V
Introduced: 2014

Answer 11

DDR4

Question 12

provides even higher data rates, increased memory capacity, and improved power efficiency. It introduces features like decision feedback equalization (DFE) to reduce signal degradation and enable higherspeeds

Speed: 3200-8400+
Voltage: 1.1V
Introduced: 2020

Answer 12

DDR5