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