Notes in your locker, car, or at home, are too far away! Retrieving Data from Secondary Storage RAM: The book on your desk is much closer! Cache: The papers in your hand are the next ones you will use!
RAM on the Motherboard Static RAM (SRAM) Very fast; Expensive; Does not need to be refreshed; Used as Cache; On Chip, Coast Card, or inside CPU; Dynamic RAM (DRAM) Slow; Cheaper; Needs constant refreshing; Used as RAM; SIMMs, DIMMs and RIMMs
Different Types of DRAM SIMM Single Inline Memory Module DIMM Dual Inline Memory Module RIMM Rambus Inline Memory Module
Older Types of RAM Conventional RAM Fast Page Memory (FPM) Extended Data Out (EDO) RAM Burst EDO (BEDO) RAM
Newer Types of RAM Sychronous DRAM (SDRAM) Synced with system clock Double Data Rate (DDR) SDRAM Most popular today 184-pin DIMMs 200-pin SODIMMs Rambus DRAM (RDRAM) Not as common Faster system bus RIMMs
Cache Memory Very fast SRAM Used to store the very next command or data needed by the CPU Three Types: L1 L2 L3
Error Correction Method used to: Detect integrity of data stored in RAM Ensure memory is complete Prevent data corruption or loss Non-Error Correcting Memory: Used in older systems to speed up memory;
Types of Error Correction Parity: Older; Cannot correct data corruption; Error Correcting Code (ECC): Newer; Most widely used; Can correct data corruption;
System Memory Conventional Memory: First 1 MB of memory; Used to run programs and store system drivers; High Memory (Hi-Mem): About 64 KB of memory just above the 1 MB point; Extended and Expanded Memory: Anything above 1 MB; Systems must run in ‘Protected Mode’ to use;
Available to the user for any software Reserved for device drivers and system functions Anything above 1 MB
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