[pchelpers] "What is the difference between SDRAM, DRAM and DDR?"
- From: "Jacqueline MacWhirter" <jmacwhirter@xxxxxxxxx>
- To: "PC HELPERS" <pchelpers@xxxxxxxxxxxxx>
- Date: Wed, 16 Jul 2003 04:19:40 -0700
This is an excellent explanation of the memory used in our computers. --
Jackie
"What is the difference between SDRAM, DRAM and DDR?"
DRAM. Dynamic Random Access Memory is used to temporarily store information
on computers. DRAM is made up of many cells and each cell is referred to as
a bit. A cell contains a capacitor and a transistor. Since computer machine
language is made up of 1s and 0s, it has the value of one when active and
zero when inactive.
SDRAM or Synchronous Random Access Memory is the result of DRAM evolution.
This type of memory synchronizes the input and output signals with the
system board. Its speed ratings are in MHz. SDRAM was introduced in 1996 and
is still used today. SDRAM transmits every clock count at a specific time.
DDR RAM (or Double Data Rate Random Access Memory) does the same but it does
so twice every clock count. This makes DDR RAM twice as fast as SDRAM. Over
the years, RAM has become very fast and efficient -- it will be very
interesting what concept is going to be develop next.
Regards, John Durham (list moderator) <http://modecideas.com/contact.html?sig>
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