RAM bus

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RAM bus is the speed at which the RAM communicates with the rest of the computer. RAM bus can be measured in either PC speeds, DDR or MHz.

PC speed DDR MHz
PC-2100 DDR266 133
PC-2700 DDR333 166.5(167)
PC-3200 DDR400 200
PC-3500 DDR434 217
PC-3700 DDR464 232
PC-4000 DDR500 250
PC-4200 DDR525 262.5(263)
PC-4400 DDR550 275
PC-4800 DDR600 300
PC-5300 DDR662.5(663) 331.25(332)
PC-5400 DDR675 337.5(338)
PC-6400 DDR800 400
PC-8500 DDR1062.5(1063) 531.25(532)
PC-9136 DDR1142 571
PC-9600 DDR1200 600
PC-10000 DDR1250 625

The numbers in the ()'s are the speeds that may be listed in some cases.