Abit PR5 Informations techniques télécharger pdf (Page 37)

The PR5 has numerous possible system memory configu-

rations using the four 72-pin SIMM sockets and the two

168-pin DIMM sockets. Please note these guidelines:

• Installed memory is auto-detected by the BIOS

• Minimum installation 2 SIMMs or 1 DIMM mod-

ule for a 64-bit data path

• Fast Page (FP), EDO and SDRAM are all supported,

SDRAM only supported on DIMM modules

• SIMMs: single or double-sided modules of 4MB and

up supported

• DIMMs: single or double-sided modules of 8MB

and up supported

• DIMM sockets support both 5-volt (FP or EDO)

and 3.3-volt (Unbuffered) DRAM; voltage for both

sockets is set by jumper JP11 (see below)

• Pairs of SIMMs must be the same memory type,

size and speed but the type and size of a second

pair, and any DIMMs can be different

• Memory Banks:

SIMM1 & SIMM2

SIMM3 & SIMM4

DIMM1

DIMM2

• Bank sequence doesn’ t matter, use any combina-

tion as long as other requirements are followed

• DRAM speed must be at least 70ns, can be faster

• Parity checking is not supported

• Maximum 128MB supported

There are numerous allowable memory configurations.

Since bank sequence is not important, as long as you use

SIMMs in pairs you can use any combination of banks.

However, for maximum performance it best to use the

same type of DRAM in all banks. SDRAM provides higher

performance than EDO DRAM and EDO is faster than

Fast Page mode DRAM.

The chart on the next page gives examples of some of

the possible configurations.

Important Note:

Double-sided Modules

There is an important limitation in us-

ing double-sided SIMM or DIMM mod-

ules. Double-sided modules in one bank

prevents the use of a corresponding

bank of the other type of module. For

example:

• If bank SIMM1/2 has 2-sided mod-

ules installed, you can not use the

DIMM2 socket.

• If bank SIMM3/4 has 2-sided mod-

ules installed, you can not use the

DIMM1 socket.

• If bank DIMM1 has a 2-sided module

installed, you can not use the SIMM3/

4 sockets.

• If bank DIMM2 has a 2-sided module

installed, you can not use the SIMM1/

2 sockets.

Double-sided modules are modules with

memory chips mounted on both sides.

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Abit PR5 Informations techniques Page 37

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