HP Compaq dx2250, Руководство по обслуживанию и справочник, Страница: 70 / 162

Memory
The computer comes with double data rate 2 synchronous dynamic random access memory (DDR2-
SDRAM) dual inline memory modules (DIMMs).
CAUTION: DDR and DDR2 memory modules are not interchangeable.
DDR2-SDRAM DIMMs
The memory sockets on the system board can be populated with up to two industry-standard DIMMs.
These memory sockets are populated with at least one preinstalled DIMM. To achieve the maximum
memory support, you can populate the system board with up to 2 GB of memory configured in a high-
performing dual channel mode.
For proper system operation, the DDR2-SDRAM DIMMs must be:
● industry-standard 240-pin
●
unbuffered PC2-5300 667 MHz-compliant
● 1.8 volt DDR2-SDRAM DIMMs
The DDR2-SDRAM DIMMs must also:
● support CAS latency 4 and 5 for DDR2/667 MHz
●
contain the mandatory JEDEC SPD information
In addition, the computer supports:
●
256Mbit, 512Mbit, and 1Gbit non-ECC memory technologies
● single-sided and double-sided DIMMs
●
DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not
supported
NOTE: The system will not start if you install unsupported DIMMs.
Installing Memory Modules
CAUTION: The memory module sockets have gold metal contacts. When upgrading the
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: Static electricity can damage the electronic components of the computer or optional
cards. Before beginning these procedures, ensure that you are discharged of static electricity by
briefly touching a grounded metal object.
64 Chapter 7 Removal and Replacement Procedures— Microtower (MT) Chassis ENWW