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Thread: Strange memory speed...




  1. #1
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    Default Strange memory speed...

    I have recently built a system using G.Skill 4gb DDR2 1066 pc2 8500 memory. When I run cpu-z its showing as pc6400 (400mhz). Should I up the dram voltage in bios from 1.8v (default) to 2.1v?

  2. #2
    stasio's Avatar
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    Default Re: Strange memory speed...

    Your memory will run DDR2 1066 5-5-5-15 with 2.0V - 2.1V(set in BIOS)
    First you should read Memory Timings Explained W/ Suggested Timings & Memset VS. BIOS
    Last edited by stasio; 03-10-2009 at 04:10 AM.
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    Default Re: Strange memory speed...

    Hmm, I don't think I need to change the voltage from 1.8v, it runs at 533mhz(1065) at either voltage. I checked with a few apps including the mobo app and cpu-z and it says its running at 533mhz so it must be ok.

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    Default Re: Strange memory speed...

    Mine says the same thing, and like you it's running perfectly at 533.3mhz(1066), I just don't understand why it says PC6400. Weird huh?
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    Default Re: Strange memory speed...

    I forgot to add I had to diffently change the voltage to 2.1, it was the only way for me to get the 8 gigs running smoothly, also a slight MCH core increase.
    Gigabyte EP45-UD3R P45 775 R (rev: 1.1),
    Intel Core2 Duo E8500 Wolfdale @ 3.80 GHz (EO),
    4 X 2GB DDR2-1066 G.SKILL PC8500CL5D
    SAPPHIRE Vapor-X Radeon HD 5770
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    ZALMAN ZM-MFC3 Fan controller
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  6. #6
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    Default Re: Strange memory speed...

    Apparently JEDEC does not a have a PC8500 spec for DDR2 so it will only show up as PC6400. So I've read anyway.

    I guess 1.8v is enough juice for 4GB to run at 533mhz but your 8GB obviously needs more power.

  7. #7
    Lsdmeasap's Avatar
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    Default Re: Strange memory speed...

    Yes that is correct most all 1066/533 Memory will show up as 800/400 in the SPD as they are programmed as such according to JEDEC Standards. It will be up to the user to manually set things up for 1066Mhz (Including timings, freq, and voltages)

    1.8V may run your ram at 1066, but I doubt that is error free. Most would be ok at 2.0V-2.1V likely, depending on other voltages and all timings applied. The spec you see on memory is just the max allowed under warranty, not always what is necessary. At high speeds such as 1066 1.8V is not usually enough to keep the memory stable at all.

    Test with this, for 5-10 full passes and you can see if it is ok or not >>
    Memtest86+ - Advanced Memory Diagnostic Tool

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    Default Re: Strange memory speed...

    Ok, thanks for that info I will try at 2.0v although I have had absolutely no crashes or errors at all since installing (over 1 week), playing GTA 4, crysis and running Fryrender. I will try the memtest86 though just to be sure.

    Also in the Bios when you change voltage to 2.0v the text colour of the voltage changes to orange/red indicating maybe overclocking? I'm not sure.

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