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  1.    23 Sep 2017 #1
    Join Date : Sep 2014
    Chicago, IL, USA
    Posts : 1,107
    Windows 10 Pro

    Memory Showing Slower Than Rated


    I bought a 32Gb kit of Corsair Vengance 2133Mhz memory (4x8Gb) from Amazon. Box showed up, factory seal, memory inside was unblemished, it had never been used.

    I installed it in my Gigabyte X79-UP4 motherboard (Rev. 1.1 with BIOS F7) using their instructions (slots 1 & 2 in bank 1, slots 2 and 4 in bank 2). Their manual and website both say the Rev. 1.1 board can handle 2133Mhz memory. Its the fastest it can take.

    The processor is a Intel i7 3930K.

    No matter what metric I use, Speccy or CPU-Z, the 2133Mhz memory is reading 656Mhz. That's lower than the 1066Mhz that was in there previously.

    I have pulled, cleaned the slots of any dust, reseated the memory, twice. Checked the BIOS settings and Gigabyte's manual and support forum. Nothing, I can't get it to read 2133Mhz.

    I'm at a loss at this point. Can anyone help, maybe steer me in the right direction or a suggestion? It would be greatly appreciated.

    Thanks.
    Last edited by Arelem; 23 Sep 2017 at 11:42.
      My ComputerSystem Spec
  2.    23 Sep 2017 #2
    Join Date : Feb 2015
    Bamberg Germany
    Posts : 17,693
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu

    Do you have XMP turned on in BIOS?
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      My ComputersSystem Spec
  3.    23 Sep 2017 #3
    Join Date : Sep 2014
    Chicago, IL, USA
    Posts : 1,107
    Windows 10 Pro
    Thread Starter

    Quote Originally Posted by Cliff S View Post
    Do you have XMP turned on in BIOS?
    Click image for larger version. 

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    Nope, because the manuals said nothing about having to change anything to use what they listed as supported memory speeds.
      My ComputerSystem Spec
  4.    23 Sep 2017 #4
    Join Date : Feb 2015
    Bamberg Germany
    Posts : 17,693
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu

    Quote Originally Posted by Arelem View Post
    Nope, because the manuals said nothing about having to change anything to use what they listed as supported memory speeds.
    try it

    You need to turn it on, to use RAM higher than your CPU's "guaranteed will work" clocks.
    For your CPU that's only:
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    Intel Coreā„¢ i7-3930K Processor (12M Cache, up to 3.80 GHz) Product Specifications

    But if your motherboard allows higher, through XMP, you need to turn it on,
    If you find it makes changes to your CPU's OC settings(on some motherboards it raises Vcore, or makes a small change to your base clock, some boards not), just write down ALL the setting pertaining to RAM, turn off XMP, then manually set it.
      My ComputersSystem Spec
  5.    23 Sep 2017 #5
    Join Date : Sep 2014
    Chicago, IL, USA
    Posts : 1,107
    Windows 10 Pro
    Thread Starter

    Quote Originally Posted by Cliff S View Post
    try it

    You need to turn it on, to use RAM higher than your CPU's "guaranteed will work" clocks.
    For your CPU that's only:
    Click image for larger version. 

Name:	image.png 
Views:	4 
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ID:	154674
    Intel Coreā„¢ i7-3930K Processor (12M Cache, up to 3.80 GHz) Product Specifications

    But if your motherboard allows higher, through XMP, you need to turn it on,
    If you find it makes changes to your CPU's OC settings(on some motherboards it raises Vcore, or makes a small change to your base clock, some boards not), just write down ALL the setting pertaining to RAM, turn off XMP, then manually set it.
    Cool, thanks for the heads up. I'll try it and get back to you
      My ComputerSystem Spec
  6.    23 Sep 2017 #6
    Join Date : Feb 2015
    Bamberg Germany
    Posts : 17,693
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu

    Quote Originally Posted by Arelem View Post
    Cool, thanks for the heads up. I'll try it and get back to you
    OK
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  7.    23 Sep 2017 #7
    Join Date : Jun 2014
    USA
    Posts : 1,595
    Windows 10 Pro x64

    Be aware that whenever you update a BIOS it's also best to load optimized defaults or whatever it's called on your board, even if you are planning on tweaking things later. Also bear in mind that most boards will have XMP disabled by default; especially true after a BIOS update.

    Good luck.
      My ComputersSystem Spec
  8.    23 Sep 2017 #8

    does it boot at the correct speed if you take 2 sticks out? does your mobo have a memory tuning option at first boot? is cpu z reporting quad or dual channel? what does it say for fsb:dram in cpu z? if you select manual for memory settings in bios and set your memory speeds yourself does it boot?
      My ComputerSystem Spec
  9.    23 Sep 2017 #9
    Join Date : Jun 2014
    USA
    Posts : 1,595
    Windows 10 Pro x64

    Due to JEDEC specs, RAM running above certain frequencies (in the case of newer systems 2133MHz) are considered to be overclocked, thus the need for XMP. And if you look at the RAM specs of today's CPU's (NOT the MB), you'll see the JDEC spec, not the maximum spec. Here's my i7-7700K - Intel Coreā„¢ i7-7700K Processor (8M Cache, up to 4.50 GHz) Product Specifications

    Notice it says 2133 for DDR4, and 1333 for DDR3. However my motherboard supports RAM up to 3600MHz. I'm running modules that run at 3333MHz and either need to set them manually to run at those speed, or Enable XMP. Also note that RAM modules pushed to their "overclocked" spec, will also need their voltage upped. My RAM for example runs at 1.2 volts at 2133, but needs 1.35 volts to run at its stated speed of 3333MHz. You can see this by looking at CPU-Z's SPD tab.
      My ComputersSystem Spec
  10.    23 Sep 2017 #10
    Join Date : Sep 2014
    Chicago, IL, USA
    Posts : 1,107
    Windows 10 Pro
    Thread Starter

    Okay, activated XMP, but the memory clock speed only went up to 1055Mhz. Here is the CPU-Z screen:
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    Still at something of a loss.

    The BIOS screen recognizes it as 2133Mhz but says 1333Mhz right next to it.

    Silly me for not knowing that "supported memory" meant that the upper end ones were considered "overclocked". I would have never wasted the money on the 2133 and bought 1600.
      My ComputerSystem Spec

 
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