Question difference between bandwidth and bus width

zuevo

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May 11, 2021
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Road analogy: Bandwidth=speed limit. Bus width=number of lanes.
thanks for reply,
but in the ram bus width are 64 bits are what it transfers to the right cpu? bandwitch would be speed that communicates with the bus?
 

Karadjgne

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Bus width is more like the volume of traffic able to be driven. A 192 would be like a 2 lane highway, you can fit 2 cars side by side, followed by 2 more etc, all doing the bus clock speed. A 256 would be like a 3 lane, a 764 like a 6 lane super highway with 6 cars side by side.

Bandwidth is the size of the car, some can carry only 2 ppl (old hdd), a bus can carry 30 ppl (Gen4 NVMe)

Bus clock is the speed the car can move, according to travel conditions.

If I got the analogies straight lol.
 
Bus width is more like the volume of traffic able to be driven. A 192 would be like a 2 lane highway, you can fit 2 cars side by side, followed by 2 more etc, all doing the bus clock speed. A 256 would be like a 3 lane, a 764 like a 6 lane super highway with 6 cars side by side.

Bandwidth is the size of the car, some can carry only 2 ppl (old hdd), a bus can carry 30 ppl (Gen4 NVMe)

Bus clock is the speed the car can move, according to travel conditions.

If I got the analogies straight lol.
LOL. You know what the real definitions are, but I didn't want to bring Mhz into the whole bandwidth definition because even though it's right, it's one more thing to try to explain.

But I think you've got the analogy as close as it can be :) Now, it will be up to the OP if all of this is more confusing than the bus width, clock speeds, and bandwidth regular definitions, lol.
 

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