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CompTIA A+ RAM
Things you need to know about RAM
18
Computer Science
Not Applicable
05/01/2020

Additional Computer Science Flashcards

 


 

Cards

Term
Ram Packaging
Definition
The way the memory chips are set up on the stick
Term
Installing RAM
Definition

1. Use the motherboard book to make sure your RAM is the correct capacity & speed. Check to make sure you install them into the proper channels. Be sure to always use the same speed DIMM for each slot.

2. Line up the notch's in the RAM and the channel & drop it straight in. Push it down to snap it in.

3. Watch the system boot to verify that it recognizes it correctly.

Term
Clock Speed
Definition

Speed of the CPU

It represents how many cycles per second it can execute and how rapidly the CPU can process data.

 

Term
Most common memory module sizes
Definition

DDR SDRAM 184 pin (pin/DIMM)

DDR2 SDRAM 240 pin

DDR3 SDRAM 240 pin

 DDR4 SDRAM 288 pin

 

SO-DIMM 200

SO_DIMM 204

Term
What technology makes simultaneous access to multiple RAM modules?
Definition
Duel channel memory provides simultaneuos access to two RAM modules when reading or writing.
Term
How do you find the DDR speed based off the clock speed?
Definition

 For DDR multiply the clock speed by 2

 

Example: If the clock is 100MHZ then it would be DDR-200

 

DDR2 multiply the clock speed by 4

 

Example: If the clock is 100MHZ then it would be DDR2-400

 

DDR3 multiply the clock speed by4

 

DDR4 multiply the clock speed by 8

 

Term
How do you get the PC speed rating based off of the DDR speed?
Definition

Multiply the DDR speed by 8

 

Example: DDR400x8=PC3200

Term
SPD Chip
Definition
SPD chips can some times be found in RAM. It allows your system to query all of the info about the RAM when you use the CPU-Z tool.
Term
Parity and ECC
Definition

Usually only used by those with advanced servers such as those in high-end financial companies or scientific servers such as those used in spacecraft. They're significantly more expensive and uncommon in home computers.

 

They both contain extra chips to detect errors with in the RAM.

 

They can function even if a chip fails.

Term
SODIMM
Definition

Small Outline Duel In-line Memory Module

 

Its chips are smaller and they are used in smaller devices such as laptop computers and printers

 

They come as follows:

DDR SDRAM SODIMM 200 pins

DDR2 SDRAM SODIMM 144 or 200 pins

DDR3 SDRAM SODIMM 204 pins

Term
DIMM
Definition

Duel In-line Memory Module

 

It is the circuit board that holds the memory chips on the RAM.

 

It is 64 bits wide.

 

It comes packaged as follows:

DDR SDRAM DIMM 184 pins

DDR2 SDRAM DIMM 240 pins

DDR3 SDRAM DIMM 240 pins

DDR4 SDRAM DIMM 288 pins

 

Term
DRAM
Definition

Dynamic Random Access Memory

 

Dynamic refers to how bits are stored in an electrical component called a capacitor. The capacitor holds the bits as a charge, but the capacitor needs to be regularly refreshed to hold the charge.  This configuration uses very few components per bit, keeping the cost low, but the constant refresh reduces speed there for is not very efficient.

Term
SRAM
Definition

Static Random Access Memory

 

It is faster than DRAM because it uses switching circuitry instead of capacitors and can hold a charge with out constant refresh. Its timing is matched to the system clock. Due to the extra components per bit  it is more expensive. Due to the speed SRAM is commonly used for CPU cache but is rarely used as the primary RAM because of its cost.

Term
SDRAM
Definition

Synchronous Dynamic Random Access Memory

 

SDRAM is synchronized with the CPU clock speed for faster speeds. Almost all primary DRAM used in computers today is SDRAM, but its often listed as DRAM to avoid confusion.

Term
DDR1
Definition

(DRR)SDRAM    184PIN DIMM

Double Data Rate     Synchronous Dynamic RAM

 

SDRAM is tied to a clock, and when the clock ticks, data is transferred. DDR double pumps and has four clocks from the same two cycles there for doubling the data rate of SDRAM.

Term
DDR2
Definition

DDR2 240PIN DIMM

200PIN SO-DIMM

 

DDR2 doubles the data rate of DDR. In addition to double pumping, it modifies the way the data is processed and can transfer twice as much data as DDR SDRAM.

Term
DDR3
Definition

DDR3 has 240pin DIMM

204 PIN SO-DIMM

 

DDR3 doubles the data rate of DDR2. It uses double pumping and further modifies the way data is processed. It can transfer four times as much data as DDR and eight times as much data as SDRAM. It is the primary type of RAM you see in most systems today. It supersedes DRAM, DDR SDRAM, and DDR2 SDRAM. 

Term
DDR4
Definition

DDR4 288PIN DIMM

 

Notable improvements that DDR4 makes over its predecessor, DDR3, are a greater range of clock speeds and timings, lower power consumption(it runs between 1.05V & 1.2V), and reduced latency. So this means that higher transfer rates can be achieved at lower voltages, which equates to greater system stability over time. The last boost that DDR4 has over DDR3 is that DDR3 configuration is 128GB max while DDR4 maxes out around 512GB.

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