Hardware Reference
In-Depth Information
However, just because higher-capacity modules are available to plug into your mother-
board, don't automatically assume the higher-capacity memory will work. Your system's
chipset, BIOS, and OS set limits on the capacity of the memory you can use. Check your
system ormotherboard documentation to see which size modules workwith it before pur-
chasing the new RAM. You should make sure you have the latest BIOS for your mother-
board when installing new memory.
Ifyoursystemsupportsdual-ortriple-channelmemory,youmustusemodulesinmatched
pairs or triples (depending on which type your system supports) and install them in the
correct location on the motherboard. Consult your motherboard manual for details.
Installing Memory Modules
Whenyouinstallorremovememory,youaremostlikelytoencounterthefollowingprob-
lems:
• Electrostatic discharge
• Improperly seated modules
• Incorrect memory configuration settings in the BIOS Setup
To prevent electrostatic discharge (ESD) when you install sensitive memory chips or
boards, you shouldn't wear synthetic-fiber clothing or leather-soled shoes because these
promote the generation of static charges. Remove any static charge you are carrying by
touching the system chassis before you begin, or better yet, wear a good commercial
grounding strap on your wrist. You can order one from any electronics parts store. A
grounding strap consists of a conductive wristband grounded at the other end through a
1-meg ohm resistor by a wire clipped to the system chassis. Be sure the system you are
working on is unplugged.
Caution
Be sure to use a properly designed commercial grounding strap; do not make one yourself.
Commercial units have a 1-meg ohm resistor that serves as protection if you accidentally
touch live power. The resistor ensures that you do not become the path of least resistance to
the ground and therefore become electrocuted. An improperly designed strap can cause the
power to conduct through you to the ground, possibly killing you.
Follow this procedure to install memory on a typical desktop PC:
1.
Shut down the system and unplug it. As an alternative to unplugging it, you can turn
off the power supply using the on/off switch on the rear of some power supplies. Wait
about 10 seconds for any remaining current to drain from the motherboard.
2.
Open the system. See the system or case instructions for details.
