Configuring system memory, Memory combinations, Configuring system memory -7 – Asus P55SP4 User Manual
Page 26: Upgrade guide
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Configuring System Memory
If you want to add system memory, you should use the configu
ration options and specifications shown in this section.
Memory Combinations
You can configure the system memory in a variety of ways, us
ing different combinations of SIMM modules. Using the 4 SIMM
sockets there are many configuration options.
Please note:
• Modules must be installed in pairs, in sequence, i.e. SIMM 1
& 2, SIMM 3 & 4, or all four sockets. The exception is you can
install one single-sided >2MB module in the SIMM 1 socket.
• Modules pairs must be the same size.
• Required Specifications:
Module Size:
Single-sided SIMMS: 1MB, 4MB, 16MB, 64MB
Double-sided SIMMS: 2MB, SMB, 32MB, 128MB
»
DRAM Type: Fast Page Mode, Asymmetric or Extended Data
Output
DRAM Speed: 70ns or faster for 50, 60 or 66MHz external
clock, EDO DRAM requires 60ns or faster for a 66MHz exter-^
nal clock setting.
RAS access time [Trac]: 60ns - 70ns
CAS access time [Tcac]: 10ns - 25ns
Parity: Either parity or non-parity
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