HP DC7800 - Manual (Page 128)

Installing Additional Memory
The computer comes with double data rate 2 synchronous dynamic random access memory (DDR2-
SDRAM) dual inline memory modules (DIMMs).
DIMMs
The memory sockets on the system board can be populated with up to four 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 8 GB of memory configured in a high-
performing dual channel mode.
DDR2-SDRAM DIMMs
For proper system operation, the DDR2-SDRAM DIMMs must be:
● industry-standard 240-pin
● unbuffered PC2-5300 667 MHz-compliant or PC2-6400 800 MHz-compliant
● 1.8 volt DDR2-SDRAM DIMMs
The DDR2-SDRAM DIMMs must also:
● support CAS latency 5 DDR2 667 Mhz (5-5-5 timing), CAS latency 5 DDR2 800 Mhz (5-5-5 timing),
and CAS latency 6 DDR2 800 Mhz (6-6-6 timing)
● contain the mandatory JEDEC SPD information
In addition, the computer supports:
● 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 operate properly if you install unsupported DIMMs.
116 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis