Memory Expansion; Dimms; Memory Module Installation - Compaq 133756-004 - Deskpro EN - 6550 Model 6400 Maintenance & Service Manual

4.10

Memory Expansion

The computer comes with synchronous dynamic random access memory (SDRAM) dual
inline memory modules (DIMMs).

DIMMs

The memory sockets on the Intel 815e chipset–based system board can be populated with
industry-standard DIMMs. These memory module slots are populated with at least one
preinstalled memory module. To achieve the maximum memory support, you may be
required to replace the preinstalled DIMM with a higher capacity DIMM.
For proper system operation, the DIMMs must be industry-standard 168-pin, unbuffered
PC100– or PC133– compliant SDRAM DIMMs, depending on the model. 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 (16 ICs per side) are not
supported; the system will not start using unsupported DIMMs.
The Intel 815e chipset supports both PC100 and PC133 SDRAM DIMMs. PC133 DIMMs
should be used for optimal operation. If both PC100 and PC133 SDRAM DIMMs are
installed in a computer, the system memory will run at the lower 100Mhz speed. Some
configurations of PC133 SDRAMs may run at 100Mhz, instead of 133Mhz.

Memory Module Installation

CAUTION:
memory, it is important to use memory modules with gold metal contacts to prevent
corrosion and/or oxidation resulting from having incompatible metals in contact with each
other.
CAUTION:
optional cards. Before beginning these procedures, ensure that you are discharged of static
electricity by briefly touching a grounded metal object. Refer to Appendix F, "Electrostatic
Discharge," for more information.
CAUTION:
Doing so may damage the module.
1. Prepare the computer for disassembly (Section 4.2).
2. Remove the computer cover (Section 4.6).
3. Rotate the drive cage to the upright position.
CAUTION:
cage to prevent damage.
4. Locate the memory module sockets.
WARNING:
!
components to cool before touching.
Your memory module sockets have gold metal contacts. When upgrading your
Static electricity can damage the electronic components of the computer or
When handling a memory module, be careful not to touch any of the contacts.
Check the position of all cables and wires before raising or lowering the drive
To reduce risk of personal injury from hot surfaces, allow the internal system
Compaq Deskpro EN Series of Personal Computers 4-15