[pchelpers] Re: "What is the difference between SDRAM, DRAM and DDR?"
- From: "Robert McLellan" <bobmclellan@xxxxxxxxxxxx>
- To: <pchelpers@xxxxxxxxxxxxx>
- Date: Wed, 16 Jul 2003 09:13:42 -0500
You forgot RDRAM
Systems implementing the RDRAM memory interface benefit from the highest
bandwidth per pin, reducing overall component count, controller pin-count
and system board cost. With densities up to 256Mbit, RDRAM components are
available in volume from leading memory suppliers in a range of speeds from
800MHz to 1200MHz. For systems requiring upgrade flexibility, RDRAM devices
may be configured into single-, dual- or quad-channel RIMM modules to
support bandwidths from 1.6 GB/sec to 10.7 GB/sec and system memory
capacities up to 8GB.
Bob McLellan
----- Original Message -----
From: "Jacqueline MacWhirter" <jmacwhirter@xxxxxxxxx>
> 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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