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Thread: ASRock Z97M OC Formula PCIe 3.0 use




  1. #1
    robman1 is offline Junior Member
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    Default ASRock Z97M OC Formula PCIe 3.0 use

    I know the Samsung SSD SM951 needs an adapter to go from M.2 to PCIe 3.0 because this motherboard's M.2 port will strangle the 951's data flow(AHCi or NVMe). I have looked at the spec sheet for board but can't deduce whether there are enough PCIe 3.0 channels for the PowerColor Radeon R9 285 2GB TurboDuo Video Card and the Samsung SM951(128GB) to be slotted in and to work at their maximum potentials. Can someone please tell me if I screwed up buying this board and if not, which PCIe 3.0 slots do I put these two components in?
    here is the specs from ASRock: ASRock > Z97M OC Formula

  2. #2
    SandsOfTime is offline Member
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    Default Re: ASRock Z97M OC Formula PCIe 3.0 use

    This motherboard has a total of 16 PCIe 3.0 lanes. They all can be used if you populate PCIE1 slot only, usually for the graphics card. But if you also populate PCIE3 for a SM951, then PCIE1 and PCIE3 will have only 8 PCIe 3.0 lanes each.
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  3. #3
    robman1 is offline Junior Member
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    Default Re: ASRock Z97M OC Formula PCIe 3.0 use

    And I recently found out the Samsung SSD SM951 was tested with only 4 lanes of PCIE 3.0 and achieving the 2K read and 1.4K write speeds. That was on Tom's Hardware site

  4. #4
    SandsOfTime is offline Member
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    Default Re: ASRock Z97M OC Formula PCIe 3.0 use

    Yes, the SM951 uses only 4 lanes. But the 16 PCIe 3.0 lanes of the motherboard can only be splitted into 16/0 or 8/8. BTW the 4 PCIe 2.0 lanes of the PCIE4 slot provide a 2K speed.
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  5. #5
    Joe-912's Avatar
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    Default Re: ASRock Z97M OC Formula PCIe 3.0 use

    Yes I have the 256GB version of the SM951 in my M2 slot on my Asus Maximus 7 Hero and it gets Seq read 763MB/s Seq write 705MB/s but I don't want to get an adaptor and put in Pcie 3 incase it causes slow down with my 970, for me I just wanted to poulate the M2 socket, and have swapped out my Sata Crucial MX200 to another desktop, I find windows 7 does fly though with the SM951
    Asus Maximus 7 Hero > Corsair Obsidian 750d Airflow > Intel 4790K > Noctua NH-D15 > 16GB G-skill Sniper 2133 > Samsung SM951 256GB > Sandisk X400 512GB > Western digital black Sata 6 500GB > Western digital black 640GB > Windows 10 Pro 64 > Asus 27" MX279H Monitor > Gibabyte GTX 980Ti extreme

  6. #6
    robman1 is offline Junior Member
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    Default Re: ASRock Z97M OC Formula PCIe 3.0 use

    That's about 1200 short of SM951 read potential and it will achieve the 2K speed in PCIE 2.0 x4. Tom's Hardware did their spec test with just that. Of course if current read/write speeds are good and you like the M.2 port fill, I get it. I wasn't happy when I learned my ASROCK Z97M OC Formula M.2 port is a darn data stranger lol

  7. #7
    Joe-912's Avatar
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    Default Re: ASRock Z97M OC Formula PCIe 3.0 use

    Yes it's a bit sad that the M2 slot on Asus Maximus only runs a x2 even though the black x4 slot is not being used
    Asus Maximus 7 Hero > Corsair Obsidian 750d Airflow > Intel 4790K > Noctua NH-D15 > 16GB G-skill Sniper 2133 > Samsung SM951 256GB > Sandisk X400 512GB > Western digital black Sata 6 500GB > Western digital black 640GB > Windows 10 Pro 64 > Asus 27" MX279H Monitor > Gibabyte GTX 980Ti extreme

  8. #8
    robman1 is offline Junior Member
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    Default Re: ASRock Z97M OC Formula PCIe 3.0 use

    So that port just sits there not even connected to board circuits?

  9. #9
    Joe-912's Avatar
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    Default Re: ASRock Z97M OC Formula PCIe 3.0 use

    It connected and its switched to x2 but I ain't got anything plugged into it, so it's a shame the M2 can't run at x4 if you know what I mean
    Asus Maximus 7 Hero > Corsair Obsidian 750d Airflow > Intel 4790K > Noctua NH-D15 > 16GB G-skill Sniper 2133 > Samsung SM951 256GB > Sandisk X400 512GB > Western digital black Sata 6 500GB > Western digital black 640GB > Windows 10 Pro 64 > Asus 27" MX279H Monitor > Gibabyte GTX 980Ti extreme

  10. #10
    Joe-912's Avatar
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    Default Re: ASRock Z97M OC Formula PCIe 3.0 use

    ASRock Z97M OC Formula PCIe 3.0 use-samsung-mzhpv256hdgl-00000-ata-device_256gb_1gb-20150814-1436-png

    I brought the Lycom M2 adaptor and put it in the PCIe2 x4 slot, now speeds are a lot better
    Asus Maximus 7 Hero > Corsair Obsidian 750d Airflow > Intel 4790K > Noctua NH-D15 > 16GB G-skill Sniper 2133 > Samsung SM951 256GB > Sandisk X400 512GB > Western digital black Sata 6 500GB > Western digital black 640GB > Windows 10 Pro 64 > Asus 27" MX279H Monitor > Gibabyte GTX 980Ti extreme

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