Asus P4G8X - Manual (Page 38)

2-12 Chapter 2: Hardware information
2.5.2 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 on memory configurations
1. Installing DDR DIMMs other than the recommended configurations
may cause memory sizing error or system boot failure. See Table 1
for the recommended configurations.
2. Install only identical (the same type and size) DDR DIMM pairs
using the recommended configurations.
3. Make sure that the memory frequency matches the CPU FSB
(Front Side Bus). Refer to Table 2 below.
4. Double-sided x16 DDR DIMMs are not supported on this
motherboard.
5. It is not recommended to create a three-DIMM configuration in
dual-channel mode. The third DIMM is ignored in the dual-channel
operation.
Sockets
Mode DIMM_A1 DIMM_B1 DIMM_A2 DIMM_B2
Single-channel — — Installed —
Dual-channel* (1) Installed Installed — —
(2) — — Installed Installed
(3) Installed Installed Installed Installed
Table 1 Recommended memory configurations
Table 2 Memory frequency/CPU FSB synchronization
* Use only identical DDR DIMM pairs.
CPU FSB DDR DIMM Type Memory Frequency
533 MHz PC2100 266 MHz
400 MHz PC1600 200 MHz