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What kind of workload pattern did you use with the ATTO benchmark? NVMe drives are multithreaded devices by design and require a decent number of threads and solid queue depth to reveal all the potential.

I cannot find a Samsung driver for it.ĭoes anyone else have the PM991 drive and have slowness? This is an OEM Win 10 installation, but when I get the new drive, I will install a fresh Win 10 21H1 from USB.ĮDIT: The BIOS shows it in the default "AHCI/NVMe" mode, not in RAID mode. One thing I find curious is that the Win 10 NVMe driver is dated 2006. Other manufacturers' forums also mention the PM991 and extreme slowness and they have firmware updates. Result Details : Updated firmware successfully. I will see what happens with the replacement drive in a few days (shipping delays!). The firmware update log file says that the update was successful as shown below, but it does not change the version when checked by various means (wmic command, Device Manager, Crystal Disk Info). It should be 26302039 after the update.Ĭ:\wmic diskdrive get caption, firmwarerevision Caption FirmwareRevision Current firmware is 25309039, as shown below and on the drive's sticker, which is what it was before running the firmware update and after running the update file. says that the firmware applies to my Vostro 5402.

While waiting for the new PM991 to arrive and being bored out of my wits, I dug deeper on the drivers page and found both a newer BIOS (1.7.1, which I installed) than SupportAssist finds (1.6.0) and I found firmware for the PM991a NVMe. I talked to a ProSupport person on Friday and they are sending a replacement drive. Its specs are 2050 read and 1300 write, yet speed tests with ATTO show 1000 read and 130 write, WAY below specs. I will call Alienware tech support later today and see if they can fix this "device is not connected" problem.I have a Vostro 5402 that has a Samsung PM991 NVMe in it, part number MZ9LQ256HAJD-000D1. * The option name can be different according to Mother-boards(M/B) manufacturers.  PCH Storage Configuration is set to “Raid Mode, or NAND/Storage Remapping option*” is enabled. However, in the PCH case, Windows Operating System cannot load the driver under following BIOS configurations where

Windows Operating System shall successfully load the driver only when Samsung NVMe SSD 960 PRO, 960 EVO or 950 PRO is installed to Recommended system configuration (minimum): The driver supports Windows 7, Windows 8.1 and Windows 10. The Samsung NVM Express Driver v2.2 Installation Guide says: So it is possible that a PRO 2TB may fail to load the driver and a PRO 1TB may load the driver successfully. One Dell technician said 2TB NVMe would work and another Dell technician said the limit was 1TB NVMe. I just installed a Samsung PRO 960 2TB and I get the same error message when I try to install the NVME driver.