2 Replies Latest reply on Feb 3, 2018 11:46 AM by ECD2

    DZ77GA-70K and 2400Mhz Memory?

    ECD2

      I have been running 1600 Mhz memory on this board without any issue.

       

      The mb specs show that this board can run 2400Mhz memory.

       

      I have purchased some new 2400Mhz memory that is rated to run at 2400.  I selected the XMP profile for 2400Mhz and the BIOS sees and accepts that setting.

       

      When I try to boot with that setting, the BIOS gives an error message that it is unable to boot.  If I go back into the BIOS and select the Automatic setting, it boots with any problem.

       

      I am currently running MemTest86 on the machine, but no errors so far (BIOS setting at 1333Mhz).

       

      Are there additional setting changes that are necessary in order to successfully use 2400Mhz memory?

        • 1. Re: DZ77GA-70K and 2400Mhz Memory?
          N.Scott.Pearson

          Whether memory will work at a certain speed with a particular individual motherboard and a particular individual processor is dependent upon whether the overall solution generates enough noise that valid data cannot be recognized during data transfers. Noise comes from the processor, from the motherboard, from the DIMMs and from the operational environment. Noise can be greater at specific frequencies as certain devices will naturally generate more noise at frequencies related to their operation. All devices will generate more noise as they age; the system that works initially at some specific frequency may not do so as time passes and lower frequencies will be necessary to continue operation. The motherboard has specific features - trace length matching, termination resistors, etc. - designed into it to help suppress noise. If the overall combination still generates too much noise when run at specific frequencies, the endpoints will not be able to differentiate noise from valid data. When this occurs, failures will occur and the memory bus could even lock up.

           

          In your case, it is obvious that this combination cannot operate at the full 2400MHz speed for these DIMMs. If they are provided, you can try using lesser XMP profiles to determine what frequency can be sustained. Having to back off all the way to 1333MHz would suck, so I hope these interim XMP profiles are included.

           

          Hope this helps,

          ...S

          • 2. Re: DZ77GA-70K and 2400Mhz Memory?
            ECD2

            Thanks for the information regarding noise.

             

            There are not any interim profiles shown; however, they seem to be an option by using the slider.  Don't know if that is really the same or different.

             

            The memory test has detected two errors now, so it looks like I will have to RMA this memory.

             

            I will test the slower speeds and report back.

             

            Regards,