From a web site:
RAM type Theoretical max. bandwidth
SDRAM 100 MHz 100 MHz X 64 bit= 800 MB/sec
SDRAM 133 MHz 133 MHz X 64 bit= 1064 MB/sec
DDRAM 200 MHz (PC1600) 2 X 100 MHz X 64 bit= 1600 MB/sec
DDRAM 266 MHz (PC2100) 2 X 133 MHz X 64 bit= 2128 MB/sec
DDRAM 366 MHz (PC2600) 2 X 166 MHz X 64 bit= 2656 MB/sec
RDRAM 600 MHz 600 MHz X 16 bit= 1200 MB/sec
RDRAM 700 MHz 700 MHz X 16 bit= 1400 MB/sec
RDRAM 800 MHz 800 MHz X 16 bit= 1600 MB/sec
the computer does work by clock speed, but to measure the Speed of mb transfer one uses MB/Second
but depenging on your pipeline the mb/sec can change...
Ram actually is measured in Nanoseconds..but that is adifferent story.
"The amount of time that RAM takes to write data or to read it once the request has been received from the processor is called the access time. Typical access times vary from 9 nanoseconds to 70 nanoseconds, depending on the kind of RAM. Although fewer nanoseconds is better, user-perceived performance is based on coordinating access times with the computer's clock cycles. Access time consists of latency and transfer time. Latency is the time to coordinate signal timing and refresh data after reading it."
But i am going way far away from the topic at hand...lol sorry