1 overview overview overview overview overview – Asus P5P800S User Manual

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1.7

System memory

1.7.1

Overview

The motherboard comes with two 184-pin Double Data Rate (DDR) Dual
Inline Memory Modules (DIMM) sockets. The following figure illustrates the
location of the sockets:

1.7.2

Memory Configurations

You may install 128 MB, 256 MB, 512 MB and 1 GB unbuffered non-ECC
DDR DIMMs into the DIMM sockets using the memory configurations in this
section.

P5P800S

P5P800S 184-pin DDR DIMM sockets

DIMM1

DIMM2

1. For optimum compatibility, it is recommended that you obtain

memory modules from the same vendor. See the DDR400 Qualified
Vendor List (QVL) on page 1-16.

2. Make sure that the memory frequency matches the CPU FSB (Front

Side Bus). Refer to the M e m o r y f r e q u e n c y / C P U F S B

M e m o r y f r e q u e n c y / C P U F S B

s y n c h r o n i z a t i o n

s y n c h r o n i z a t i o n table below.

3. Always install DIMMs with the same CAS Latency.

4. Double-sided DDR DIMMs with x 1 6

x 1 6

x 1 6 (data bus=16bit) memory chips

are not supported due to chipset limitation.

Memory frequency/CPU FSB synchronization

This motherboard supports different memory frequencies depending on the
CPU FSB (Front Side Bus) and the type of DDR DIMM.

C P U F S B

D D R D I M M T y p e

M e m o r y F r e q u e n c y

800 MHz

PC3200/PC2700/PC2100

400/320*/266 MHz

533 MHz

PC2700/PC2100

333/266 MHz

*When using 800 MHz FSB CPU, PC2700 DDR DIMMs run only at 320MHz
(not 333MHz) due to chipset limitation.