Compaq AP550 Compaq Professional Workstation AP550 Maintenance & Service G - Page 62

Memory Modules, Correcting ECC Direct Rambus Inline Memory Modules RIMMs. Additional RIMMs - dual

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Removal and Replacement Procedures 3-29 Memory Modules Overview The Compaq Professional Workstation AP550 supports the following memory modules: s RIMMs-The workstation supports 600-MHz and 800-MHz Error Checking and Correcting (ECC) Direct Rambus Inline Memory Modules (RIMMs). Additional RIMMs are available to upgrade the memory. A maximum of 32-count Direct RDRAMs is supported. The workstation memory includes Dual Direct RDRAM channels with 32-line cache to store prefetched information. NOTE: 600-MHz represents the total data transfer rate with a 300-MHz bus.800-MHz represents the total data transfer rate with a 400-MHz bus. The workstation has four RIMM sockets on the system board (two per memory channel) to support a maximum of 2-gigabyte of memory with 256-megabit Direct RDRAM technology. RIMM modules must be installed in pairs across both channels, for example, one module in socket XMM1 and the other module in socket XMM3. Each pair of memory modules must be of the same type, speed, and size. This information can be found on the label affixed to the RIMM. Continuity RIMMs (CRIMMs) must populate empty RIMM slots. If CRIMMs are not installed in the empty RIMM sockets, the system will not boot. s DIMMs-Some workstation models come with a synchronous dynamic random access memory (SDRAM) expansion board installed that supports at least 64-megabyte of Error Checking and Correcting (ECC). The SDRAM expansion board allows the use of up to four dual inline memory modules in a RIMM-based system.

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Removal and Replacement Procedures
3-29
Memory Modules
Overview
The Compaq Professional Workstation AP550 supports the following memory modules:
■
RIMMs
—The workstation supports 600-MHz and 800-MHz Error Checking and
Correcting (ECC) Direct Rambus Inline Memory Modules (RIMMs). Additional RIMMs
are available to upgrade the memory. A maximum of 32-count Direct RDRAMs is
supported. The workstation memory includes Dual Direct RDRAM channels with 32-line
cache to store prefetched information.
NOTE:
600-MHz represents the total data transfer rate with a 300-MHz bus.800-MHz represents the
total data transfer rate with a 400-MHz bus.
The workstation has four RIMM sockets on the system board (two per memory channel)
to support a maximum of 2-gigabyte of memory with 256-megabit Direct RDRAM
technology. RIMM modules must be installed in pairs across both channels, for example,
one module in socket XMM1 and the other module in socket XMM3. Each pair of
memory modules must be of the same type, speed, and size. This information can be
found on the label affixed to the RIMM. Continuity RIMMs (CRIMMs) must populate
empty RIMM slots. If CRIMMs are not installed in the empty RIMM sockets, the system
will not boot.
■
DIMMs
—Some workstation models come with a synchronous dynamic random access
memory (SDRAM) expansion board installed that supports at least 64-megabyte of Error
Checking and Correcting (ECC). The SDRAM expansion board allows the use of up to
four dual inline memory modules in a RIMM-based system.