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Problem in RAM FSB

I have two 2gb DDR2 ram 800FSB each. Bt softwares which checks the whole pc hardwares (Like everest or CPUID) they says DDR2 800(400MHz) . I am using asus P5KMPL AM\PS . My question is why there has 400MHz in bracket? my rams are 800 FSB but why they are showing 400MHz?

please help me..............
5 answers Last reply Best Answer
More about problem
  1. 400MHz is actual speed because of Dual Data Rate (DDR) it becomes effective 800MHz!
  2. rolli59 said:
    400MHz is actual speed because of Dual Data Rate (DDR) it becomes effective 800MHz!


    i didn't understand what you said... both memory sticks are of 800MHz so they should run in 800MHz separately,correct? please explain me elaborately. I am confused what is hapenning. These are my mobo FSBs. O.C means overclocked...
    FSB 1600(O.C.)/1333/1066/800 MHz
    DDR2 1066(O.C.)/800/667 MHz
  3. Best answer
    800Mhz ram runs at 400MHz, 1066 ram runs at 533MHz and so on. The advertised speed is based on effective speed not actual speed. Here is an article http://en.wikipedia.org/wiki/DDR2_SDRAM
    The bus clock on 800MHz ram is 400MHz
  4. Best answer selected by jayadratha.
  5. rolli59 said:
    800Mhz ram runs at 400MHz, 1066 ram runs at 533MHz and so on. The advertised speed is based on effective speed not actual speed. Here is an article http://en.wikipedia.org/wiki/DDR2_SDRAM
    The bus clock on 800MHz ram is 400MHz



    Thanks for the info. you guys are really awesome.........
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