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Thread: Set the Clock Skew for Intel X48 chipset and P45

  1. #1
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    Aug 2007
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    Set the Clock Skew for Intel X48 chipset and P45

    This guide is addressed to the lucky owners of motherboards based on Intel X48 chipset and P45 (only from Asus), and provided that the manufacturer has authorized the alteration of this setting in your BIOS.To ensure that you have the option to adjust or not, go to the settings menu and look for the ram to 2 lines adjust the Clock Skew for ram 2 channels (values are selectable in "ps" pico seconds ).

    what does the Clock Skew?

    As you probably know on a motherboard information through tracks integrated to the PCB. The memory ports are no exception and therefore are soldered to the motherboard. The only problem is that these directions should in theory be the exact same size, which in a process of mass production is very tedious especially expensive, and thus resulting in longer runway between a channel memory and another. As usual stock at this discrepancy does not feel, but as our trick is to go beyond the limits and we can be bother by the phenomenon (corruption of data, conflict ...). Quickly to correct it must advance or delay the sending of a given channel memory. These offsets should allow us to higher Bencher memory for a given benchmark.

  2. #2
    Join Date
    Aug 2007
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    1,098

    Re: Set the Clock Skew for Intel X48 chipset and P45

    Setting the BIOS

    Set your BIOS / max stable configuration known to the benchmark for which you want to tweak ram.Assure that your configuration can deal with at least a 22 MHz FSB (always remaining stable). You can check this by using a lower memory ratio while retaining the same settings for the CPU, the FSB and else . It must also set the Clock Skew on normal for channels A + B before you start.


    Find the max stable setting and best values of the different clock Skew

    Now first check if a value different from Clock Skew between channel A and B. First move the setting of channel B of the smallest possible value, look at the result with your benchmark. After only delay the channel A with the normal channel B ,verify the result. Then invert delays with advances

    example:

    Channel A = Normal / Channel B = 30ps Advance
    Channel A = 30ps Delay / Channel B = Normal
    Channel A = Advance 30ps / Channel B = Normal
    Channel A = Normal / Channel B = Delay 30ps
    After these tests you must be able to say whether different values for the channels A and B help you stabilize / increase your ram frequency according with benchmark ,otherwise you will need that each channel requires the same value. If different values are favorable, look at extending the difference (increase the value of settings) brings better results.
    You can try to move forward and simultaneously delay or to keep a channel set to normal thereby increasing the difference to the next channel until you find the best values.

    Now that you know the difference better to have (or know that such equivalent value for all channels is best), check whether advance or delay all channels still provides additional gains, this keeping the difference found in the channel A and B (or maintaining an equivalent value for each channels). You should be able to see fairly quickly if you need to move forward or backward the channels (always keeping the gaps found above) and be able to zoom in on the best combination for your clock skew.

    Adjust value of difference for Clock Skew


    You can reset the value of difference for Clock Skew found once your session finished, but in the future, with the same conditions the values should not change.


    Improved frequencies


    • The Clock Skew values may require to be adjusted for different latencies rated ram ratio or benchmark. However, they should always be close to you first found.
    • The values of Clock Skew will be different for each motherboard, even if they are of the same model. There is no need to copy the settings of Clock Skew on another person, it would really not be good for your frequencies.
    • Make sure you remember what was the order of memory on the motherboard, and also which slots were used. Otherwise you should adjust all if the order get reverse.

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