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Compaq Professional Workstation AP200 Maintenance and Service Guide
Memory Modules
Important Guidelines for DIMM Installation
When installing DIMMs, you MUST follow these guidelines:
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Use only 16-, 32-, 64-, or 128-MB unregistered 100-MHz Error Checking and
Correcting (ECC) synchronous dynamic random access memory (SDRAM) dual inline
memory modules (DIMMs).
■
Self-refresh DIMMs are required on models with three DIMM sockets.
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DIMMs must be industry-standard 168-pin 100-MHz or faster unregistered SDRAM
DIMMs. The SDRAM DIMMs must support CAS Latency 2 or 3 (CL=2 or CL=3).
They must also contain the mandatory Joint Electronic Device Engineering Council
(JEDEC) Serial Presence Detect (SPD) information.
■
DIMMs constructed with x4 SDRAM are not supported; the system will not start using
unsupported DIMMs.
■
DO NOT MIX REGISTERED AND UNREGISTERED, OR ECC AND NON-ECC
SDRAM DIMMS. OTHERWISE, THE SYSTEM WILL NOT FUNCTION
PROPERLY.
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A DIMM can be installed one way only. Be sure to match the two key slots on the
DIMM with the tab on the DIMM socket. Push the DIMM down into the DIMM socket,
ensuring that it is fully inserted and properly seated.
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When upgrading, do not exceed 384 MB total. The system will not boot if total memory
exceeds 384 MB.
CAUTION: DIMM sockets have gold metal contacts. When upgrading memory, it
is important to use DIMMs with gold metal contacts (not tin-lead) to prevent
corrosion and/or oxidation resulting from having incompatible metals in contact
with each other.
CAUTION: When handling a memory module, be careful not to touch any of the
contacts. Doing so may damage the module.
