Asus P4P8X 1.9.1 Memory configurations, Important notes

1.9System 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

DIMM A1	DIMM A2	DIMM B1	DIMM B2
			80 Pins
			104 Pins

P4P8X 184-Pin DDR DIMM Sockets

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.

1-14 Chapter 1: Product introduction