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Old 07-11-2009, 12:24 AM   #1 (permalink)
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Default Ram Question?

I got a question, when looking at different types of RAM for PC's i see that it has two different numbers for the speeds. one of then is the MHz which i understand, but the one i dont understand is the PC-5400 or like PC2-6500 or something like that.
Could some one please explain to me what this speed rating is of, and how its calculated. thanks you.
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Old 07-11-2009, 03:10 AM   #2 (permalink)
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Default Re: Ram Question?

the number pc3200 is the maximum transfer rate in MB/sec.

As a general rule you multiply speed X 8 to get maximum transfer rate.

So as an example ddr400 pc3200 ram runs at 400mhz so 400 x 8 = 3200 or pc3200 for the maximum transfer rate.
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Old 07-11-2009, 12:09 PM   #3 (permalink)
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Default Re: Ram Question?

ok that makes sense. why is by multiplied by 8 though? just curious, and does that value ever change?
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Old 07-11-2009, 12:20 PM   #4 (permalink)
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Default Re: Ram Question?

I believe 8 stands for 8 bits in a byte
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Old 07-11-2009, 01:17 PM   #5 (permalink)
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Default Re: Ram Question?

The maximum transfer rate for a memory module can be calculated thru the following formula:

Maximum Theoretical Transfer Rate = clock x number of bits / 8

Since DIMM modules transfer 64 bits at a time, “number of bits” will be 64. As 64 / 8 equals to 8, we can simplify this formula to:

Maximum Theoretical Transfer Rate = clock x 8

Understanding RAM Timings | Hardware Secrets
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Old 07-12-2009, 02:58 PM   #6 (permalink)
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Default Re: Ram Question?

Wow thats cool. lol. its like im understanding a different language here, haha. but it all makes sense so its all good.
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