Mixing Ram

Discussion in 'Building a new PC' started by Xoft, Apr 28, 2009.

  1. Xoft

    Xoft Member

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    My Asus P5QL has 4 RAM slots, 2 are coded yellow and 2 black where you put ram in pairs to work optimally right.

    So I bought some new 1066Mhz ram (2 x 2GB) and it worked great, I was wondering if I could put the old ram (667Mhz 2 x 1GB) in the remaining black slots.

    Would I lose performance, would my fast ram downclock? I thought for some reason it would be fine be I am pairing ram in their pairing slots.

    Thanks
     
    Xoft, Apr 28, 2009
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  2. dailun

    dailun Active member

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    AFAIK, if you set the mobo to autodetect it will downclock everything to the slowest speed.

    If you manually set the memory speed, the slow RAM may choke and/or die and the PC won't run correctly.

    RAM is paired for dual channel operation ONLY. All of the memory is on the same memory bus.
     
    Last edited: Apr 28, 2009
    dailun, Apr 28, 2009
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  3. KillerBug

    KillerBug Active member

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    Also, the voltage might be different...if this is the case then some of the memory will be underpowered or overpowered. Either way it is a bad thing.
     
    KillerBug, May 1, 2009
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