"DDR" stands for "Double Data Rate". The memory
clock is actually an electrical signal that bounces between
two voltage levels. With standard SDRAM, data is transferred
from the memory to the processor when the clock signal bounces
from LOW to HIGH. With DDR, data is transferred not only when
the clock signal goes from LOW to HIGH, but also when the
clock signal goes from HIGH to LOW. Voila! Twice as much data
on each tick of the clock! DDR memory upgrades can do two
operations per clock cycle, making them twice as fast as SDRAM.
Note:
- Check your owner's manual and compare the specifications of the memory with the specifications supported by your motherboard manufacturer.
- Check the module(s) has been seated completely after installation.
- Install the largest capacity memory module first.
Installation Procedures
- Place the computer's power switch in the "off " position
and disconnect the AC power cord.
- Before touching any electronic components, make sure
you first touch an unpainted, grounded metal object to discharge
any static electricity stored on your clothing or body.
- Locate the memory expansion sockets on the computer's
motherboard. If all the sockets are full, remove smaller
capacity modules to allow room for higher capacity modules.
- The ejector tabs shown in the illustration are used to
remove a module. By pushing outward on the ejector tabs,
the module will pop-up from the socket and it can then be
removed.
- Handle your new module(s) carefully; do not flex or bend
the module(s). Always grasp the module by its edges.
- For most installations, DDR modules can be installed
in any available expansion slot. Other installations may
require the memory to be installed in a particular sequence
based on the modules capacity. Check your owner's manual
to determine the correct installation sequence for your configuration.
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