Help Please: 1866Mhz DDR3 16gb CL10 vs. 2400Mhz DDR3 32gb CL11

Discussion in 'General Hardware' started by Stickman116, Apr 20, 2017.

  1. Stickman116

    Stickman116 Active Member

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    Hi,

    I wanted to get some help on the best ram to keep in my PC.

    My PC Spec:
    I7 3960x @4.2ghz processor
    Asus X79-Deluxe motherboard
    Corsair 850w 80plus gold PSU
    Titan Xp video card

    Main use: mostly gaming, some "light" work (Maya 3D, Photoshop, after FX and zbrush) once in a while.

    My question:
    I already have 2 sets of ram, what is best to keep in my PC for gaming performance?
    1. Corsair Dominator Platinum DDR3 1866mhz 16gb cl10 (dual channel 2x8gb)
    2. Corsair Dominator Platinum DDR3 2400mhz 32gb cl11 (quad channel 4x8gb) - I can only get 24gb (triple channel)to show for anything over 1866mhz ram clock in bios and windows. It recognizes that 4 sticks are present. It just doesn't count all 32gb if I use the xmp and anything over 1866mhz.

    Which is better to keep in my system? And does it hurt to keep all 4 sticks plugged in and running 2400mhz (if this is better)even if windows only sees it as 24gb?

    Thanks in advance!
     
  2. David Lake

    David Lake Master Guru

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    Run some benchmarks, I doubt you will see much difference.
     
  3. Stickman116

    Stickman116 Active Member

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    Does it hurt to leave all 4 sticks (8gbx4)plugged in even if Windows only reports 24gb? I would like to run the ram at the 2400mhz advertised speed.
     
  4. Guru01

    Guru01 Member Guru

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    I would do the quads for that motherboard. With X.M.P enabled you should see the ram @2400MHz unless you need a bios update. Just make sure the timings and voltage is set correctly.
     

  5. Stickman116

    Stickman116 Active Member

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    I have xmp enabled, but for some reason, my motherboard only supports 32gb quad channel on 1866mhz and below. If it's 2133 or 2400 MHz like the xmp sets it, windows will only see 24gb instead of the full 32gb. I think it's a limitation of the motherboard and the 3960x. I do have the latest available bios.

    The question is, if I wanted to run triple channel 24gb @2400mhz based on xmp, is it ok to leave the extra stick in there since windows isn't recognizing it? Should I stick to 1866mhz quad channel to get 32gb?
     
    Last edited: Apr 21, 2017
  6. Agent-A01

    Agent-A01 Ancient Guru

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    Leave all 4 sticks in.

    Go to bios and tell me what your VCCSA and VTTCPU voltages are.

    Also make sure they are in the correct slots, mobo manual will tell you which ones to use for quad channel.
     
  7. Stickman116

    Stickman116 Active Member

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    Here are those voltages:
    CPU VCCSA Voltage: 1.220v (manual mode)
    CPU VCCSA Manual Voltage 1.200v
    VTTCPU Voltage: 1.066v (auto)

    The RAM are in the correct slots according to the manual. A1, B1, C1 and D1.

    The RAM reads as quad channel when all 32gb are recognized at 1866mhz.
    It becomes triple channel when speed is raised above 2133mhz and only 24gb is recognized.
     
  8. The Goose

    The Goose Ancient Guru

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    Your cpu is rated for up to 1600 so anything over is putting load on the cpu/motherboard, in my personal experience as far as gaming and ddr speeds you will notice no difference and anything over 16 gig really is a waste but if your rendering then 32 might be helpful but you might need to run it a lower speeds, either way the difference is minuscule. What about running 8 @1600...if your details are correct your board supports 128gb.
     
    Last edited: Apr 21, 2017
  9. pharma

    pharma Master Guru

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    Happened to me in the past regarding underreporting memory capacity. Resolved by slowly increasing increasing memory voltages until it reported all memory sticks.
     
  10. Agent-A01

    Agent-A01 Ancient Guru

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    1.2v manual is really high for 1866/2400

    CPUs have sweet spots for those voltages and can negatively impact if it's too high/low.

    Try a manual voltage of .9v to 1.05v.

    Increase in steps of .025 to see if sticks show up.

    If it doesn't help just leave it around .95~ as that will be more than enough usually.

    VTTCPU you may try 1.15v~ or so.
    It can help with memory stability as well.
     

  11. Stickman116

    Stickman116 Active Member

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    Thanks, Agent a01, goose and pharma. I tried to adjust the voltage incrementally and still had no luck. I currently have it at 1866mhz c11 quad channel with all 32gb showing up. 2400mhz c11 dominators feel under-utilized. Couldn't get them to c10 timings, rated for 11-13-13-31-2N, couldn't do 10-12-12-30-2N to post.
     
  12. pharma

    pharma Master Guru

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    I guess no need to ask if you're using the latest bios. I seem to remember something similar happening when I had my Asus x79 deluxe but the issue became resolved through increased volts. I believe you should also have some pre-defined memory settings in the bios (similar to Rampage Extreme MB). Have you tried any of those?

    Had this link saved that might help.
    http://techreport.com/review/25310/asus-x79-deluxe-motherboard-reviewed
     
  13. Agent-A01

    Agent-A01 Ancient Guru

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    What strap are you using?

    100 or 125?

    Have you tried 2133

    Make sure ram voltage is set correctly.

    Some may not take to reducing timings without voltage increase.
     
  14. Agent-A01

    Agent-A01 Ancient Guru

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    Try this updated bios 4805 that I have modded
    Includes various updated OROM/EFI drivers and also CPU microcode updates that may help.

    Download

    Also, update your intel ME firmware(this controls many things on a chipset level)

    Instructions below.
    Firmware update file here

    and here are the tools to update firmware.

    To update:
    1. Rename firmware bin to ME.bin
    2. Place the ME.bin into fwuplcl folder(either regular or 64 folder, does not matter)
    3. Open CMD prompt as admin from the directory (or change directory to fwupdlcl folder) and type "fwupdlcl -f ME.bin"(if you use 64 obviously change what you type)

    Edit: Just noticed you have a 3960x.

    2400mhz will not work. Sandybridge is limited to a maximum of 2133.
    Sandybridge memory controllers aren't strong enough for those speeds.

    You will need 4930k or similar to run 2400.

    Still, the above steps may help you run 2133 at lower timings.
    Plus always good to be on latest updates for fixes/performance improvements.
     
    Last edited: Apr 21, 2017
  15. Stickman116

    Stickman116 Active Member

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    Thanks. I'm getting a "Failed security verification" error when installing the bios file. I was able to install the Intel ME file.
     

  16. Agent-A01

    Agent-A01 Ancient Guru

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    You'll need to flash the bios via usb flash back on fat32 formatted.

    Sometimes bios flash overrides ME so check it again after you update bios.
     
  17. Stickman116

    Stickman116 Active Member

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    It's the modified 4805 bios file itself that has an error. I copied it to a fat32 formatted USB and it's the file itself that has a problem. I can't Flash the bios unless I have a working bios update file. I currently have the 4805 file from Asus installed.
     
  18. Agent-A01

    Agent-A01 Ancient Guru

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    As i said its normal and the only way to do it is via USB bios flashback.

    You put it in the correct port and hold down the bios flashback button for a few seconds, wait for it to stop blinking.

    It said verify failed because it's modded.

    There's nothing wrong with the file, it's just a security check to verify it hasn't been tampered with.

    Which is why you do usb flashback to get around it.

    Guide here
    http://event.asus.com/2012/mb/USB_BIOS_Flashback_GUIDE/
     

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