|Dec4-12, 11:34 AM||#1|
DDR Memory help
I know if I have a DDR2 Memory that is 800 MHz and it is 64 Bit the math to findout the Data Transfer is
800,000,000 X 64 = Data Transfer.
But will this give me the Data Transfer in just Bits Per SEC. or MB Per SEC?
|Dec4-12, 11:56 AM||#2|
This might help:
so for DDR-400
200 MHz clock --> 400 MHz data rate
8*400 MHz --> 3200 MB/s
so in your case 800 *8 -> 6400 MB/s
|Dec4-12, 10:17 PM||#3|
I did have a look at your link and I think this got me more confused.
If I want to know my Transfer Rate for my DDR2 800MHz 64 Bit DiMM in Bytes I do the math like this
800MHz X 64 then take the out come and Divid by 8
Will give me Transfer in Bytes per sec Right?
|Dec4-12, 11:56 PM||#4|
DDR Memory help
I noticed that a given Hz was doubled because the memory is read on the up cycle and on the down cycle of the clock signal. If the memory is transferred in parallel on a 64 bit or larger bus then your answer 800 * 8 is the MB/sec speed is correct but if say the data was transferred on a smaller 32 bit bus then the rate would be half or 800 * 8 / 2 MB/sec.
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