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ASUS P4P8X motherboard user guide
1-15
This motherboard supports different memory frequencies depending on the CPU
FSB (Front Side Bus) and the type of DDR DIMM.
* For dual-channel configuration (3), you may:
• install identical DIMMs in all four sockets, or
• install identical DIMMs in DIMM_A1 and DIMM_B1 (blue sockets)
and identical DIMMs in DIMM_A2 and DIMM_B2 (black sockets)
Sockets
Mode DIMM_A1 DIMM_A2 DIMM_B1 DIMM_B2
(blue) (black) (blue) (black)
Single-channel (1) Populated — — —
(2) — Populated — —
(3) — — Populated —
(4) — — — Populated
Dual-channel (1) Populated
— Populated —
(2) —
Populated — Populated
(3)* Populated Populated Populated Populated
Table 1 Recommended memory configurations
Table 2 Memory frequency/CPU FSB synchronization
CPU FSB DDR DIMM Type Memory Frequency
800 MHz PC3200 400 MHz
533 MHz PC2700/PC2100 333/266 MHz
400 MHz PC2100 266 MHz
• When overclocking to 800MHz CPU FSB, the system supports only
DDR400 (PC3200) DIMMs due to chipset limitation.
• The following FSB/DDR ratios are not supported: 400/333, 400/400,
533/400.