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CIT165 Chapter 7

CIT165 Chapter 7 - Memory Terms

Burst EDO (BEDO) Improved on EDO, but was rarely used. You might encounter it on some 72-pin SIMMs or 168-pin DIMMs.
CAS Latency (CL) A feature of memory that reflects the number of clock cycles that pass while data is written to memory.
C-RIMM (Continuity RIMM) A placeholder RIMM module that provides continuity so that every RIMM slot is filled.
DDR An improved version of SDRAM.
DDR2 A version of SDRAM that is faster than DDR and uses less power.
DDR3 An improvement over DDR and DDR2 that is faster and uses less power.
Direct Rambus DRAM A memory technology by Rambus and Intel that uses a narrow network-type system bus. Memory is stored on a RIMM module. Also called RDRAM or Direct RDRAM.
Direct RDRAM Another term for Direct Rambus DRAM.
Double Data Rate SDRAM A type of memory technology used on DIMMs that runs at twice the speed of the system clock.
DDR SDRAM An abbreviation for Double Data Rate SDRAM.
double-sided A DIMM with memory chips installed on both sides of the module.
dual channels A motherboard feature that improves memory performance by providing two 64-bit channels between memory and the chipset. DDR and DDR2 memory can use dual channels.
dual ranked Double-sided DIMMs that provide two 64-bit banks.
dynamic RAM (DRAM) The most common type of system memory, it requires refreshing every few milliseconds.
ECC (error-correcting code) A chipset feature on a motherboard that checks the integrity of data stored on DIMMs or RIMMs and can correct single-bit errors in a byte. More advanced ECC schemas can detect, but not correct, double-bit errors in a byte.
EDO (extended data out) A type of outdated RAM that was faster than conventional RAM because it eliminated the delay before it issued the next memory address.
FPM (fast page memory) Can be used with 30-pin or 72-pin SIMMs or some really old 168-pin DIMMs.
General Protection Fault (GPF) A Windows error that occurs when a program attempts to access a memory address that is not available or is no longer assigned to it.
memory bank The memory a processor addresses at one time and is 64 bits wide.
parity An error-checking scheme in which a ninth, or “parity,” bit is added. The value of the parity bit is set to either 0 or 1 to provide an even number of ones for even parity and an odd number of ones for odd parity.
parity error An error that occurs when the number of 1s in the byte is not in agreement with the expected number.
RDRAM Another term for Direct Rambus DRAM.
re-marked chips Chips that have been used and returned to the factory, marked again, and resold. The surface of the chips may be dull or scratched.
RIMM An outdated type of DRAM with 184 pins.
SIMM (single inline memory module) An outdated type of DRAM with 72 or 30 pins.
Single channel A DIMM in which the memory controller can only access one DIMM at a time.
single ranked Single-sided DIMMs providing only one 64-bit bank.
single-sided A DIMM with memory chips installed on one side of the module.
SO-DIMM (small outline DIMM) a smaller version of a DIMM used on laptops.
synchronous DRAM (SDRAM) The first DIMM to run synchronized with the system clock. It has two notches, and uses 168 pins.
triple channels Accessing three DIMMs at the same time.
Created by: Leisac