Compaq AlphaServer ES40 Instrukcja Użytkownika Pobierz pdf (Strona 9)

Memory Options

Each memory option consists of four 200-pin industry-

standard DIMMs. The DIMMs are synchronous DRAMs.

The Model 1 system supports up to four memory options (16

DIMMs), and the Model 2 system supports up to eight options

(32 DIMMs). Memory options are available in the following

sizes:

•

256 Mbytes (64 MB DIMMs)

•

512 Mbytes (128 MB DIMMs)

•

1 Gbyte (256 MB DIMMs)

•

2 Gbytes (512 MB DIMMs)

With the 2 GB option, Model 1 supports 8 GB memory and

Model 2 supports 16 GB memory. In the future, when 1 GB

DIMMs become available, the maximums will be 16 and 32

GB, as supported by the architecture.

Memory Motherboard

PK-0324-99

Memory Configuration

A memory option (or set) consists of four DIMMs, and all four

DIMMs must be the same size.

•

Fill sets in numerical order. Populate all 4 slots in Set 0,

then populate Set 1, and so on.

•

An array is one set for systems that support 16 DIMMs

and two sets for systems that support 32 DIMMs.

•

DIMMs in an array must be the same size and type. For

example, suppose you have populated Sets 0, 1, 2, and 3.

When you populate Set 4, the DIMMs must be the same

size and type as those installed in Set 0. Similarly, Set 5

must be populated with the same size and type of DIMMs

as are in Set 1, and so on, as indicated in the following

table.

Array Model 1 System Model 2 System

0 Set 0 Set 0 and Set 4

1 Set 1 Set 1 and Set 5

2 Set 2 Set 2 and Set 6

3 Set 3 Set 3 and Set 7

Memory Performance Considerations

With one memory option (4 DIMMs) installed in either Model

1 or Model 2, memory operation interleaving will not occur.

With two memory options (8 DIMMs), memory read-write

operations are two-way interleaved. Interleaved operations

reduce the average latency and increase the memory

throughput over noninterleaved operations. With four memory

options (16 DIMMs) installed, memory read-write operations

are four-way interleaved, maximizing memory throughput.

Memory Arrays and Sets on Memory Motherboards

Array 0

Sets 0 & 4

Array 1

Sets 1 & 5

Array 2

Sets 2 & 6

Array 3

Sets 3 & 7

Sets

PK0330-99

MMB 2

MMB 0

MMB 3

MMB 1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 17 18

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