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Just a Quik Memory Question


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#1
pgarvie

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hello
I have a
Jetram 512 DDR400 DIMM 2.5-3-3
Transcend 256 DDR266 DIMM 2.5-3-3
first off what does the DDR400 and DDR266 stand for is it the speed of the ram
& If I Use them together will the one slow the other down?
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#2
Retired Tech

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Try here

http://www.4allmemor...tails&faq_id=87
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#3
Guse

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Heya,

From the Wikipedia:

DDR SDRAM or double-data-rate synchronous dynamic random access memory is a type of memory integrated circuit used in computers. It achieves greater bandwidth than ordinary SDRAM by transferring data on both the rising and falling edges of the clock signal (double pumped). This effectively nearly doubles the transfer rate without increasing the frequency of the front side bus. Thus a 100 MHz DDR system has an effective clock rate of 200MHz when compared to equivalent SDR SDRAM, the "SDR" being a retroactive designation.

With data being transferred 8 bytes at a time DDR RAM gives a transfer rate of (memory bus clock rate) * 2 (for dual rate) * 8 (number of bytes transferred). Thus with a bus frequency of 100 MHz, DDR-SDRAM gives a max transfer rate of 1600 MB/s.


As for your other question, to the best of my knowledge the RAM can only operate at the speed of the slowest stick. So if you put the DDR400 with the DDR266, you'll run both at 266.
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#4
pgarvie

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cool thnx,
it probably wouldn't be a good idea to mix the two then :tazz: oh well
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