All Aboard! P4 with 200 MHz FSB and the i875P Dual DDR400 Chipset

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Overview Of Memory Bandwidths

In asynchronous mode, because of the factor of 5/4 when using a 200 MHz FSB CPU, the result is a 160 MHz memory clock (DDR320). If you install a 133 MHz FSB CPU onto the board, then numerator and denominator switch to 4/5 - and the result here is 166 MHz (DDR333).

Swipe to scroll horizontally

FSB	Memory	FSB/Memory
100 - 132 MHz	DDR266 (133 MHz)	3/4
133 - 199 MHz	DDR266 (133 MHz)DDR333 (166 MHz)	1/14/5
200 - (overclock) MHz	DDR266 (133 MHz)DDR320 (160 MHz)DDR400 (200 MHz)	3/25/41/1

Swipe to scroll horizontally

Memory Type	Labeling	Eff. Clock	Data Bus	Bandwidth
SDRAM66	PC66	66 MHz	64 Bit	0.5 GB/s
SDRAM100	PC100	100 MHz	64 Bit	0.8 GB/s
SDRAM133	PC133	133 MHz	64 Bit	1.1 GB/s
DDR266	PC2100	133 MHz	64 Bit	2.1 GB/s
DDR266-Dual	PC2100	133 MHz	64 Bit	4.2 GB/s
DDR333	PC2700	166 MHz	64 Bit	2.7 GB/s
DDR333-Dual	PC2700	166 MHz	64 Bit	5.4 GB/s
DDR400	PC3200	200 MHz	64 Bit	3.2 GB/s
DDR400-Dual	PC3200	200 MHz	64 Bit	6.4 GB/s
RDRAM 400	PC800	400 MHz	16 Bit	1.6 GB/s
RDRAM 400-Dual	PC800	400 MHz	2 x 16 Bit	3.2 GB/s
RDRAM 533-Dual	PC1066	533 MHz	2 x 16 Bit	4.2 GB/s
RDRAM 600-Dual	PC1200	600 MHz	2 x 16 Bit	4.8 GB/s