GEN3 m.2 only taking 2 lanes instead of 4? (gen3x2 instead of gen3x4)

I looked on Samsung magician and saw that under interface it marked

PCIe Gen.3 x 2 and when I run a benchmark it gives me 1700 read
1500 write. Witch is half of the advertised speed ?

my board is a MAXIMUS VIII HERO
apparently if you overclock the cpu it messes with the m.2 settings so I reverted it back to the default settings

I forced Gen 3 on the PCI storage settings and forced the x4 but still the same problem.

I even turned my grafix card on x8 to see if its a lane problem but it still marks it as a gen.3x2

Can some on educate me XD I don't think i know whats going on..

I also have a samsung 850 evo and a WD 1tb HHD
Reply to Mat Sauve
6 answers Last reply
More about gen3 taking lanes gen3x2 gen3x4
  1. You haven't identified the SSD you are running. Also keep in mind the advertised speeds are theoretical maximums. The performance specifications for the top of the line Samsung 960 Pro are; Up to 3,500 MB/sec SEQUENTIAL READ --- Up to 2,100 MB/sec SEQUENTIAL WRITE, with the caveat; Performance may vary based on system hardware & configuration. In real world use people rarely come close to those numbers.

    http://ssd.userbenchmark.com/Compare/Samsung-960-Evo-NVMe-PCIe-M2-500GB-vs-Samsung-960-Pro-NVMe-PCIe-M2-512GB/m204072vsm182182
    Reply to rocktalkrock
  2. rocktalkrock said:
    You haven't identified the SSD you are running. Also keep in mind the advertised speeds are theoretical maximums. The performance specifications for the top of the line Samsung 960 Pro are; Up to 3,500 MB/sec SEQUENTIAL READ --- Up to 2,100 MB/sec SEQUENTIAL WRITE, with the caveat; Performance may vary based on system hardware & configuration. In real world use people rarely come close to those numbers.

    http://ssd.userbenchmark.com/Compare/Samsung-960-Evo-NVMe-PCIe-M2-500GB-vs-Samsung-960-Pro-NVMe-PCIe-M2-512GB/m204072vsm182182


    sorry about that, its a 960 evo,
    the thing thats botherring me is inder the interface it's listed as gen 3 x 4
    correct me if im wrong but "3" is the gen and "2" is the lanes right take a look at the screen shot :

    From what iv seen from other users it should be 3x4, my board supports it and just as a test i unplugged all my drives except for my m.2, same problem.

    960EVO
    Reply to Mat Sauve
  3. Yes, "3" is the gen and "2" are the lanes. You are right.

    If you have "Intel Rapid Storage Technology" installed on your motherboard, check in Device Manage how it is configured. I think it's listed under Storage Controllers. It may affect how many PCIe lanes are allocated to the M.2 drive. That's just a guess.
    Reply to rocktalkrock
  4. Check out this video, particularly at the 3:40 mark. M.2 Mode & PCIe x4 Mode is displayed in the BIOS. It's a different Asus motherboard but the same general idea.

    https://www.youtube.com/watch?v=v7PEBscJbno
    Reply to rocktalkrock
  5. rocktalkrock said:
    Check out this video, particularly at the 3:40 mark. M.2 Mode & PCIe x4 Mode is displayed in the BIOS. It's a different Asus motherboard but the same general idea.

    https://www.youtube.com/watch?v=v7PEBscJbno


    I see what you mean,

    I think you found the problem but not the solution...
    In my bios settings under advanced/on-board devices/ PCIE X4_3 bandwith
    Im missing an option; it says X2 mode or x4 mode,
    but I don't have the option for m.2 mode like in the video.

    My bios is the latest version/ same with my m.2 / and windows.
    I'm looking on asus if there's like a addon package to install on my bios,
    I doubt it tho.
    Reply to Mat Sauve
  6. I think the best thing for you to do is contact Samsung Customer Support via chat or email. The drive must still be under warranty.

    Tell them you have a 960 EVO plugged into an Asus MAXIMUS VIII HERO motherboard and their Samsung Magician software is telling you the drive is only running at PCIe Gen.3 x2, not x4 as it should. They should be able to tell you if this can be changed, or if not then why.
    Reply to rocktalkrock
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