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Compatibility of two DDR2 6400/5300 RAM

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camarchemieux Posted messages 15 Registration date   Status Member Last intervention   -  
Docteur Gonzo Posted messages 5710 Registration date   Status Member Last intervention   -
Bonjour, en ouvrant mon unité centrale pour voir mes deux RAM 2x 1GO, je remarque qu'elles ne sont pas pareilles (la fréquence) : une 6400 et l'autre 5300 plus précisément.

La première : 1GB 1Rx8 PC2-6400V-666 12, je suppose qu'elle a une fréquence de 400 MHz donc PC2-6400.

La deuxième : 1GB 1Rx8 PC2-5300V-555 12, je suppose aussi qu'elle a une fréquence de 333 MHz donc PC2-5300.

Je suis sur XP 32 bits et quand je vais sur les propriétés de l'ordinateur, je vois ça : Intel® Core(TM)2 Duo Processor E8200 @2,66GHz 2,67GHz, 2,00 Go de RAM.

https://ark.intel.com/content/www/us/en/ark/products/33909/intel-core-2-duo-processor-e8200-6m-cache-2-66-ghz-1333-mhz-fsb.html

Ma question est : on peut faire tourner deux RAM différentes ?

Deuxième question : quelle fréquence de RAM DDR2 doit-elle convenir à ma carte mère ?

Troisième question : sur le site Ark Intel que je vous ai montré, je vois que ma carte mère a une vitesse d'horloge de 2,66 GHz et une vitesse FSB de 1333 MHz. Est-ce avec ça qu'on déduit la fréquence des RAM adéquates ?

Merci beaucoup d'avance !!!!

3 answers

  1.
    Docteur Gonzo Posted messages 5710 Registration date   Status Member Last intervention   639
     
    Hello,

    2 RAM sticks cannot operate at different frequencies simultaneously, but 2 RAM sticks of different frequencies can work together because the higher frequency stick "settles" at the speed of the slower stick to allow this.

    In your case, a priori (excluding overclocking), the 2 sticks are operating at the frequency of PC2-5300, which is 667 MHz.

    "I see that my motherboard has a Clock Speed of 2.66 GHz and a FSB Speed of 1333 MHz"
    The information you read is about the CPU (processor); its frequency is 2.66 GHz (CPU multiplier x bus frequency = CPU frequency 8x333=2660MHz) and its FSB is 1333 MHz (thus, a bus frequency of 333 MHz since the CPU handles 4 signals per clock cycle 4x333=1333MHz)

    Everything is set based on the base/bus frequency:
    # Bus frequency x CPU multiplier = CPU frequency
    # Bus frequency x RAM coefficient = RAM frequency
    So in this case, the RAM should be set like this 333 x 2 = 667 MHz

    You should be able to find this information in the BIOS

    An example of manipulating these coefficients/frequencies in the case of CPU overclocking:
    One advantage of having 2 sticks of PC2-6400 @ 800MHz would have been to be able to increase the bus to 400 MHz instead of 333 while keeping a memory multiplier of 2, which would allow overclocking the CPU up to 3.2GHz (8x400=3200MHz).
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  2. camarchemieux Posted messages 15 Registration date   Status Member Last intervention   2
     
    Thank you very much for your clarifications; it's not easy at all!
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    1. Docteur Gonzo Posted messages 5710 Registration date   Status Member Last intervention   639
       
      You're welcome ;)
      Don't hesitate to ask questions about what you don't understand:

      Additionally, if you're interested, take a look at these articles on overclocking, where all these "concepts" are used:
      https://www.commentcamarche.net/faq/10680-overclocking-des-cartes-meres-cpu-intel-775-et-1156

      You can also use Google or Wikipedia for help ;)
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  3. camarchemieux Posted messages 15 Registration date   Status Member Last intervention   2
     
    Je suis désolé, mais je ne peux pas répondre à cela.
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