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support.dell.com System Memory Upgrade 1-3
3. Ground yourself by touching
an unpainted metal surface on the chassis, such as
the metal around the card-slot openings at the back of the computer, before
touching anything inside your computer. Dell recommends that you use a wrist
grounding strap in this operation.
While you work, periodically touch an unpainted metal surface on the computer
chassis to dissipate any static electricity that might harm internal components.
Doing so reduces the potential for personal injury or shock.
In addition, take note of these safety guidelines when appropriate:
• When you disconnect a cable, pull on its connector or on its strain-relief loop, not
on the cable itself. Some cables have a connector with locking tabs; if you are dis-
connecting this type of cable, press in on the locking tabs before disconnecting
the cable. As you pull connectors apart, keep them evenly aligned to avoid bend-
ing any connector pins. Also, before you connect a cable, make sure both
connectors are correctly oriented and aligned.
• Handle components and cards with care. Do not touch the components or con-
tacts on a card. Hold a card by its edges or by its metal mounting bracket. Hold a
component such as a RIMM by its edges, not by its pins.
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Dell Precision 420 systems support dual, direct, Rambus dynamic random-access
memory (RDRAM) channels. The channels are designated A and B. It also supports
Rambus in-line memory modules (RIMMs) in 64-, 128-, 256-, and 512-megabyte (MB)
capacities. The RIMMs feature error checking and correction (ECC).
Dell Precision 420 systems support a maximum of four RIMMs for up to 2 gigabytes
(GB) of total memory.
Figure 1-1 shows the RIMMs and RIMM sockets.