Computer/Windows/Office/ Discussion Blog

September 14, 2017

How is memory bandwidth calculated?

Filed under: computer knowledge — admin @ 6:32 pm

Q: see the newspaper often introduces memory and memory bandwidth, I want to know whether they are how to calculate? What is the relationship between it and frequency and bit? Which is more important?

Answer: memory bandwidth calculation formula: bandwidth = memory, clock frequency * memory bus number * multiplying factor /8. In the current DDR400 memory as an example, its operating frequency is 200MHz, the data bus number is 64bit, the rising edge and falling edge of the transmission of data, so the multiplication coefficient is 2, the bandwidth is 200 x 64 x 2/8 = 3.2GB/s (if it is a dual channel, two memory bandwidth is composed of the 6.4 GB/s). It is obvious that the operating frequency can hardly be doubled and raised at the present level of technology. At this point, the number and multiplication factor of data buses are a breakthrough point in technology.
To remind, in the purchase card, do not just look at the memory size, but also pay attention to the factors of memory interface, unless there are special requirements, 64bit video card game player we are not recommended to buy.

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