System Memory Objective 3.2 Flashcards
Random Access Memory (RAM)
▪ Used to load applications and files into a non-persistent and fast storage area
Disk Cache
▪ Pulls the files from the disc into memory and replaces the old file
Cache
▪ High-speed memory
Dual Data Rate (DDR)
▪ Most common type of memory
● PC133-133 MHz
Throughput
▪ Calculated based on the bus speed and the width of the data bus
Dynamic RAM (DRAM)
▪ Oldest type of memory that requires frequent refreshing
Synchronous DRAM (SDRAM)
▪ First memory module that operates at the same speed as the motherboard bus (168-pin connector)
● PC66 (66 MHz bus)
● PC133 (133 MHz bus)
● PC266 (266 MHz bus)
Double Data Rate Synchronous Dynamic Random-Access Memory (DDR SDRAM)
▪ Doubles the transfer speed of an SRAM module (184-pin connector)
Double Data Rate 2 Synchronous Dynamic Random-Access Memory (DDR2
SDRAM)
▪ Higher latency and has faster access to the external bus (240-pin connector)
● PC2-4200 - 4200 MB/s or 4.2 GB/s
Double Data Rate 3 Synchronous Dynamic Random-Access Memory (DDR3 SDRAM)
▪ Runs at a lower voltage and at a higher speed than DDR2 (240 keyed pin connector)
● PC3-10600 - 10600 MB/s or 10.6 GB/s
▪ DDR3 throughput is 6.4 to 17 GB/s with a maximum module size of 8GB per memory module
Small Outline Dual In-line Memory Module (SODIMM)
▪ Classified as DDR3, DDR4, or DDR5 (common in laptops)
Multi-Channel Memory
▪ Uses two different memory modules to increase the performance and throughput
- Single-Channel
- Dual-Channel
- Triple-Channel
- Quad-Channel
ECC Memory
Non-Parity Memory
▪ Standard memory that does not check for errors and allows data to be put in or taken out
Parity Memory
▪ Performs basic error checking and ensures the memory contents are reliable
DDR5
▪ Has an internal error checking for its modules
