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Thread: 8 GB PC2-8500 on GA-MA78GM-S2H




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    Question 8 GB PC2-8500 on GA-MA78GM-S2H

    Is this feasible (8 x 2GB)? I have read elsewhere that you can only use two memory modules when they are running faster that DDR2 800. Can anyone verify this?

    I have also read that 4 modules at more than 400 MHz was possible by increasing the bus speed and dropping the CPU and bus multipliers. They also said this put an additional load on the chipset CPU and motherboard and could lead to problems. Is that true?

    My Phenom x4 9600 BE was running fine on this motherboard with 8 GB of DDR2 800 memory. I'm starting to think I should not have messed with it. Most of my tests with faster memory have failed, even with only two sticks.

    Are my time and money being wasted here?

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: 8 GB PC2-8500 on GA-MA78GM-S2H

    You mean 4x2GB for 8GB right? Yes, most of the time if you are running 8GB 1066Mhz is VERY hard to get going, let along stable.

    You may be able to run 900 or so, but 1066 is asking for headaches. If you REALLY need 8GB just do not expect to run 1066

    Yes you would have various ways to run your multi's to get various speeds. And yes 8GB will put a strain on things

    Your CPU must also support 1066, so keep that in mind incase you do decide to just get 4GB of 1066

    I do not have much AMD Knowledge so sadly I cannot offer much more advice on things. Sounds like what you had though was good, and even with 1066 modules you may not be able to expect much more with 8GB then what you had with the 800Mhz modules

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    Default Re: 8 GB PC2-8500 on GA-MA78GM-S2H

    Thanks, Lsdmeasap.

    I'm currently seeing what I can do with each 4G kit separately.

    Currently testing at 4.0 x 225 = 900 MHz, with CPU = 2250, and busses at 2025.

    I need all 8G for my virtual machines. Using Microsoft Hyper-V.

  4. #4
    Lsdmeasap's Avatar
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    Default Re: 8 GB PC2-8500 on GA-MA78GM-S2H

    Sounds like a plan, you can likely do 900 with all 8GB easy I would think. It is just when you get up to 975-1000+ that things get tricky

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    Default Re: 8 GB PC2-8500 on GA-MA78GM-S2H

    Thanks

    Either pair can do 4.00 x 250 MHz or 5.33 x 200 MHz, no problem.

    When I put them together, even 800 MHz is a problem. It seems ok, with multiple instances of memtest finding no problems, but Hyper-V is another story.

    I can start one virtual machine, but if I try to start a second, it reports that there is not enough memory. I get an error such as "unable to allocate 1024 MB of RAM. The available memory is 2548 MB...".

    So, I played with my available modules and found which two pair work together at 800 MHz. I think I'll leave it that way until I have four modules of DDR2 1066 that are all the same.

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