Assign#1 Memory Vid/Overview of Memory - CompTIA A+ 220-1001-3.3 Flashcards
RAM AKA
Random Access Memory
Where is data stored permanently?
Hard drive or SSD
from where to where are programs and data moved when accessed and changed?
from SSD or hard drive to RAM
Memory types have…
…changed through the years
what’s driven the change in memory types?
standardization and technology
what’s mainly determines overall speed, performance of computer?
transfer speed in/out of RAM
DIMM AKA
Dual inline memory module
What’s the Dual for in DIMM?
Dual for the both sides of the same edge has one set of different contacts on each side
DIMM have how much data width
64 bit data width
SO-DIMM AKA
Small Outline Dual In-line Memory Module
SO-DIMM is about
half the width as a DIMM
where are SO-DIMM used?
Laptops, and mobile devices
DIMM would be found in
desktop computer
DRAM AKA
Dynamic Random Access Memory
what kind of memory is DIMM?
DRAM
Why DRAM is dynamic?
Dynamic because needs constant refreshing. the data is lost if it’s not refreshed.
Why DRAM is random?
because any storage location/data can be accessed directly any place at any time
what kind memory technology is un-random-like-accessible like random in RAM?
magnetic tape
What kind of DRAM would you find on today’s computers?
Synchrounous DRAM
SDRAM AKA
synchronous DRAM
Why SDRAM is synchronous?
synchronizes with common system clock of computer
why SDRAM must be synchronous?
so the standard flow of communication based on clock cycles can cue things up in a very standard format.
SDRAM queues up what?
one process while waiting for another
what’s different about SDRAM than old classic DRAM?
classic DRAM didn’t wait for a clock signal
SDR AKA
Single data rate
DDR AKA
Dual data rate
what is SDR?
where one bit of data can be transferred during one clock cycle
what is DDR?
where two bits of data can be transferred during one clock cycle
what is DDR2?
2nd generation of DDR, and twice as fast as original DDR.
can you choose whatever generation of DDR you want?
no, none of them are backwards or forward compatible. You must use whichever the system requires.
what is DDR3?
3rd generation of DDR, it’s twice as fast as DDR2, larger chip capacities, and brought maximum size 16GB per DIMM
DDR# AKA
Double Data Rate (# of gen)
What is DDR4?
it’s faster than DDR3, and increases DIMM to 64GB
