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Chapter 1: Product introduction
1.9 System memory
The motherboard comes with four Double Data Rate (DDR) Dual Inline Memory
Module (DIMM) sockets. These sockets support up to 4GB system memory using
184-pin unbuffered non-ECC PCPC2700/PC2100 DDR DIMMs. The following
figure shows the location of the DDR DIMM sockets.
P4P8X
®
P4P8X 184-Pin DDR DIMM Sockets
80 Pins104 Pins
DIMM_A
1
DIMM_A
2
DIMM_B
1
DIMM_B
2
1.9.1 Memory configurations
You may install 64MB, 128MB, 256MB, 512MB, and 1GB DDR DIMMs into the
DIMM sockets using the memory configurations in this section.
Important notes
1. Installing DDR DIMMs other than the recommended configurations may
cause memory sizing error or system boot failure. Use any of the
recommended configurations in Table 1.
2. In dual-channel configurations, install only identical (the same type and
size) DDR DIMM pairs for each channel.
3. Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules from the
same vendor.
4. Make sure that the memory frequency matches the CPU FSB (Front Side
Bus). Refer to Table 2.
5. DIMMs installed into any three sockets will function in single-channel
mode.
6. When all four sockets are populated with 1GB DIMMs (total 4GB), the
system may detect only 3+GB (a little less than 4GB) due to ICH5 resource
allocation.
7. Double-sided DDR DIMMs with x16 (databus width = 16-bit) memory chips
are not supported due to chipset limitation.
8. It is recommended to use the blue DIMM slots first.