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  1. #1
    ROG Guru: Orange Belt Array XYchromosone PC Specs
    XYchromosone PC Specs
    MotherboardASUS Maximux XI Extreme [BIOS 1602]
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    Storage #12 X Samsung 970 Pro NVMe 1TB M.2 SSD [DIMM.2_1+ DIMM.2_2]
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    why PCIe 16_1 is only 8x with Dimm2_1 SSD

    I have a GTX 1080ti installed in my PCIe 16_1 slot and a Samsung 970 Pro NVMe M.2 1TB installed in the Dimm2_1 card. However the PCIe 16_1 is only running at 8x [see screenshot]. Is there a way to run the vga at 16x? Maybe I have to install the SSD in the M.2 port? instead of the Dimm2?
    I keep forgetting which ports share which resource in regards to M.2 or Dimm2. I think though that Dimm2 shares with PCIe16_1 while M.2 is linked directly to the CPU? I must find a place where this info is shared online. Maybe someone could start a thread with this info for member's benefit. TIA for any help guys.
    Miniatura de Adjuntos Miniatura de Adjuntos 200318120834.jpg  

    Last edited by XYchromosone; 03-18-2020 at 02:14 AM.

  2. #2
    ROG Guru: Yellow Belt Array pndiode PC Specs
    pndiode PC Specs
    Laptop (Model)ASUS G752VL-DH71
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    why PCIe 16_1 is only 8x with Dimm2_1 SSD

    Using the DDR4 DIMM.2_Slot. ROG MAXIMUS XI Extreme BIOS Manual User’s Manual (English).

    Click image for larger version. 

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    Try using the M.2_1 (Socket 3) on the motherboard to see if that makes a difference.

  3. #3
    ROG Guru: Orange Belt Array XYchromosone PC Specs
    XYchromosone PC Specs
    MotherboardASUS Maximux XI Extreme [BIOS 1602]
    Processori9 9900KS
    Memory (part number)G.Skill Trident Z RGB CL17 3600MHz 32GB [4x8]
    Graphics Card #1ASUS ROG Strix Gaming GTX 1080Ti 11GB
    MonitorAOC AGON AG271QG 27" 144Hz [165Hz OC]
    Storage #12 X Samsung 970 Pro NVMe 1TB M.2 SSD [DIMM.2_1+ DIMM.2_2]
    Storage #2Samsung 850 Evo SSD 500GB SATA 3
    CPU CoolerThermaltake Floe Riing 360 Premium AIO
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    Keyboard RAZER Blackwidow X Tournament Chroma
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    thank you pndiode, i initially installed the SSD in t he M.2_1 port and if I recall PCIe 16_1 ran at 16 x. I wonder which gives best SSD performance? M.2 or Dimm.2?

    If I recall one of the ports runs from the PCM and the other to the CPU, but I'm not sure which port or slot runs with what device? thanks again.

  4. #4
    ROG Guru: Yellow Belt Array pndiode PC Specs
    pndiode PC Specs
    Laptop (Model)ASUS G752VL-DH71
    MotherboardROG Maximus IX Extreme
    ProcessorI7-7700K
    Memory (part number)G-Skill F4-3600C19Q-32GTZRB
    Graphics Card #1ROG GTX 980 MATRIX-GTX980-P-4GD5 Bykski Water N-AS98ROG-X Full Cover
    Graphics Card #2ROG GTX 980 MATRIX-GTX980-P-4GD5 Bykski Water N-AS98ROG-X Full Cover
    MonitorSAMSUNG S22D300HY (2 ea)
    Storage #1WD Black SN750 1TB
    Storage #2WD Blue 4TB (4 ea)
    CPU CoolerEK PE 360 (Top), PE 240 (Front), and Xres 100 Elite
    CaseROG Strix Helios
    Power SupplyThermalTake Toughpower 1200W
    Keyboard Cerberus
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    I wonder which gives best SSD performance?

    I might be wrong, but the DDR4 DIMM.2 will give better performance with a M.2 SSD. Due to the DDR4 DIMM.2, being tied to the CPU (can move data faster). Whereas, the chipset (PCM/PCH) is crying I have to take care of all these! I do not care (CPU) and I require more lanes to process this data, therefore, I am going to take 8 PCIe lanes from you (chipset) to increase my data flow. Chipset (PCM/PCH) blew a gasket (I am going to get hot/pissed), I have to take care of all these with an additional loss of 8 PCIe lanes.

    Now try going from Chipset (PCM/PCH) to CPU using M.2 (Socket 3).

    Click image for larger version. 

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  5. #5
    ROG Guru: Orange Belt Array XYchromosone PC Specs
    XYchromosone PC Specs
    MotherboardASUS Maximux XI Extreme [BIOS 1602]
    Processori9 9900KS
    Memory (part number)G.Skill Trident Z RGB CL17 3600MHz 32GB [4x8]
    Graphics Card #1ASUS ROG Strix Gaming GTX 1080Ti 11GB
    MonitorAOC AGON AG271QG 27" 144Hz [165Hz OC]
    Storage #12 X Samsung 970 Pro NVMe 1TB M.2 SSD [DIMM.2_1+ DIMM.2_2]
    Storage #2Samsung 850 Evo SSD 500GB SATA 3
    CPU CoolerThermaltake Floe Riing 360 Premium AIO
    CaseFractal Design Define R6 Black
    Power SupplyCorsair AX1600i
    Keyboard RAZER Blackwidow X Tournament Chroma
    Mouse RAZER Lancehead [ambidextrous] Chroma
    Headset Sennheiser RS165 Wireless
    Headset/Speakers Sennheiser CX 100 inner ear headphones
    OS Windows 10 Pro x64 + Ubuntu Studio 20.04
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    well since I'm connected to DIMM.2_1 I will leave it. however I'm not certain why the PCIe16_1 is running at 8 x if DIMM.2 is connected directly to the CPU? I guess it means it takes 8 PCIe lanes for CPU connection by DIMM.2_1?

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