Upgrading Main Memory Modules; Mixing Memory Modules - HP Kayak XU 04xx User Manual

Upgrading Main Memory Modules

The PC Workstation has 128 MB of unbuffered ECC SDRAM main
memory installed in one DIMM slot. Can a 512 MB Registered
memory module be added to a second DIMM slot to upgrade the
memory?
No. To upgrade the memory, you can use 64 MB, 128 MB or
256 MB ubuffered memory modules (ECC SDRAM). Or, alter-
natively, replace the existing 128 MB memory module and
install a 512 MB Registered ECC SDRAM memory module.
Main memory modules are available in 64 MB, 128 MB, 256 MB and 512 MB
ECC SDRAM modules. However, it is important to note that the 64MB, 128
MB and 256 MB modules are unbuffered ECC SDRAM modules, while the
512 MB modules are registered ECC SDRAM modules. Refer to the table on
page 5
Workstation.

Mixing Memory Modules

Unbuffered and registered ECC modules are not compatible with each
other, and cannot be mixed. If these have been mixed, this will be
Error!
detected in the basic pre-boot tests when you boot the system for the
first time. The BIOS checks that the inserted DIMMs are compatible with
RAM type
one another, and if it detects an error, it is reported to the HP MaxiLife.
The error message (shown on the left) will then be displayed on the LCD
status panel. Refer to the following table for DIMM compatibility rules.
Original DIMM Type
Unbuffered ECC
Registered ECC
for details on how much main memory can be installed on each PC
Adding Unbuffered ECC
(512 MB)
Upgrading Main Memory Modules
Adding Registered ECC (512 MB)
1
Yes
No
No
Yes
27