Asus X99-Deluxe/U3.1 + Samsung 950 Pro (250GB) M.2 Speed Issues? Solved

  1. Posts : 9
    Windows 10 Professional x64 (Build 10586)
       12 Jun 2016 #1

    Asus X99-Deluxe/U3.1 + Samsung 950 Pro (250GB) M.2 Speed Issues?


    I have the following:

    - Asus X99-Deluxe/U3.1
    - Intel i7-5820K Extreme Hex Core CPU Processor (3.30GHz, 15MB Cache, 28 Lanes)
    - Samsung 950 PRO NVMe M.2 256 GB Solid State Drive
    Asus STRIX GTX970-DC2OC-4GD5 NVIDIA GeForce GTX 970 Graphics Card

    I have only the Asus Graphics Card in the PCIEX16_1 which is running at PCI-E 3.0 16x as expected. I have removed the USB3.1 card that comes with this motherboard for testing purposes so I literally only have the Graphics card installed.

    The board has an onBoard M.2 x4 Rev 3 connector which the Samsung 950 PRO is installed into.

    I believe this connector should allow 32Gb/sec bandwidth (since it uses PCI-E 3.0 x 4) - please note there is also an optional card where you can add the M.2 (or a second M.2) into a PCI Express slot - I'm NOT using this card, just the onBoard connector.

    Samsung Magician says the following:
    - Controller: Samsung NVMe Controller (Driver Ver: 1.4.17)
    - PCIe Slot: PCI Express Root Port 1 - 2F03
    > Link Speed Cur: 4Gbps, Max: 8Gbps
    > Link Width Cur: x4, Max: x4
    > Bandwidth Cur: 16Gbps, Max: 32Gbps

    The performance data also suggests this - the read speed should be a lot higher but seems to be reduced, whereas write speed which is a lower number is over the actual "Upto Speed".

    It appears as if my SSD is running at PCI-E 2.0 speeds? The bandwidth is being throttled. Any ideas how I make it go to 32Gbps instead of 16Gbps?

    Thanks in advance!
      My ComputerSystem Spec

  2. Posts : 9
    Windows 10 Professional x64 (Build 10586)
    Thread Starter
       12 Jun 2016 #2

    Believe it or not, I've just stumbled across the solution.

    I am using high FSB Corsair Dominator sticks and had them using an XMP (Extreme Memory Profile) - essentially my memory was overclocked.

    I thought I'd try running in "normal" mode ie. stock settings and when I checked, the Samsung Magician is now showing as 32Gbps!!

    The motherboard must sacrifice something to run the Memory at the higher clock speed which means it can't run the M.2 at PCI-E 3 and has to drop it to PCI-E 2.

    Worth baring in mind for anyone else trying to achieve these elusive 32Gbps speeds

      My ComputerSystem Spec

  3.    12 Jun 2016 #3

    Thanks for posting your fix to your problem........just might help others......
      My ComputersSystem Spec

  4. Posts : 9
    Windows 10 Professional x64 (Build 10586)
    Thread Starter
       12 Jun 2016 #4

    Hope so.... might save them their Sunday afternoon that I've spent trying to figure this one out! :)
      My ComputerSystem Spec


Related Threads
This is just what is says. A fresh win 10 install on a new SSD. Do not explain to me about cloning. To date I've upgraded the BIOS (UEFI) on a ASUS P67 Performance Gen3 motherboard. I've changed the SATA Mode to AHCI. I can see the drive in...
Installed a Samsung Pro 950 in the M2 slot on the X99A mobo - great speed. Is it possible to install a second M2 drive in one of the remaining PCIe 3.0 x4 slots and get "full" speed? I have Windows 10 Insider build 11099 on C:\, 950 Pro, if I...
I have a Asus P6T Deluxe motherboard with 24 gigs of Corsair memory running Windows 10 64 bit. I have the Intel 965 Extreme Edition CPU. I tried to access the Asus AI Suite by download but once i try to install it i get a message..."Not for this...
Hello, all, My desktop computer, that has an Asus M2N32-SLI Deluxe Wireless Edition motherboard, with an AMD Phenom II X4 processor and 6GB of RAM, BIOS version 5002, upgraded to Win10 without any issues, using the online upgrade from Microsoft....
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 10:14.
Find Us