HP 89XXY, 79XXY manual DDR DIMMs, RIMMs

DIMMs

DIMMs must be 168-pin unbuffered SDRAM (synchronous dynamic random access memory), compliant with the Intel® PC SDRAM Unbuffered DIMM Specification. The HP Pavilion ships with one or more memory modules, but you can replace the existing memory module(s) with higher-capacity ones. You can install 64 MB, 128 MB, or 256 MB memory modules in the computer.

DDR DIMMs

DDR DIMMs must be 184-pin unbuffered DDR SDRAM (double data rate synchronous dynamic random access memory). The HP Pavilion ships with one or more memory modules, but you can replace the existing memory module(s) with higher-capacity ones. You can install 64 MB, 128 MB, or 256 MB memory modules in the computer.

RIMMs

RIMMs must be 184-pin RDRAM (Rambus dynamic random access memory), non-ECC (non- error correction checking), compliant with the Rambus/Intel specification.

The motherboard has four RIMM sockets that are for a dual-channel configuration. The following requirements must be met:

3Rambus signaling level technology permits 600 and 800 MHz transfer rates. The HP Pavilion uses PC600 or PC800 RDRAM modules.

3All four RIMM sockets must be filled. If you do not populate a socket with a RIMM, the empty socket must be filled with a C-RIMM (continuity RIMM). Two C-RIMMs are included on the motherboard.

Note: A C-RIMM does not contain any memory — it is only a placeholder card used to close the memory circuit. C-RIMMs are necessary to avoid breaking the signal lines, which are a serial connection in a Rambus interface; this assures the electrical integrity.

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