Asus P4P8X Recommended memory configurations, Table 2 Memory frequency/CPU FSB synchronization, Table, (1), (2), (3), (4), (1), (3), PC3200, PC2100, CPU FSB, 800 MHz

Table 1		Recommended memory configurations
					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

*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)

Table 2 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.

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.

ASUS P4P8X motherboard user guide 1-15