# Should I return this Black SN850X drive due to under performance?

**URL:** <https://forums.sandisk.com/t/should-i-return-this-black-sn850x-drive-due-to-under-performance/267374>\
**Category:** WD\_BLACK | Blue | Red | Green | Gold SSD\
**Created:** [February 22, 2023, 5:32pm UTC](https://forums.sandisk.com/t/should-i-return-this-black-sn850x-drive-due-to-under-performance/267374 "2023-02-22T17:32:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bacillus](https://avatars.discourse-cdn.com/v4/letter/b/bbe5ce/32.png) [@bacillus](https://forums.sandisk.com/u/bacillus)\
**Post date:** [February 22, 2023, 5:32pm UTC](https://forums.sandisk.com/t/should-i-return-this-black-sn850x-drive-due-to-under-performance/267374/1 "2023-02-22T17:32:09Z")

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I’ve just built a new pc that comprise:  
Asus Prime z790P wifi motherboard  
Intel I7 13700K  
MSi radeon rx6700xt graphics card  
WD\_Black SN850X NVMe 1TB (DOM 16 NOV 2022) Firmware Version 620311WD.

The NVMe is in the slot closest to the cpu (slot M\_ 1) and the bios setting for the drive is set to Auto detect (I’ve also tried forcing the Gen 4 setting manually).  
The WD dashboard app tells me it’s Gen 4 using 4 lanes.  
In device manager the drive policy states write caching is enabled.

I’ve tried running with and without the Intel rapid storage technology setting enabled in bios with no performance improvement.

As you can see from the pic , the drive falls far short of the expected up to 7300MB/s speed claim.

 ![AS Nvme result](https://global.discourse-cdn.com/sandisk/original/3X/c/8/c8897dbf3e2054155377450a76802ce1613dc837.jpeg)

What else can I try or should I just replace the drive?  
btw I’ve had no response from Support with logged Incident #: 230221-000210

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**Author:** ![Keerti\_01](https://avatars.discourse-cdn.com/v4/letter/k/9fc348/32.png) [@Keerti\_01](https://forums.sandisk.com/u/Keerti_01)\
**Post date:** [February 24, 2023, 12:38pm UTC](https://forums.sandisk.com/t/should-i-return-this-black-sn850x-drive-due-to-under-performance/267374/2 "2023-02-24T12:38:13Z")

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Hi @bacillus,

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting:  
[https://support-en.wd.com/app/ask](https://support-en.wd.com/app/ask)

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**Author:** ![bacillus](https://avatars.discourse-cdn.com/v4/letter/b/bbe5ce/32.png) [@bacillus](https://forums.sandisk.com/u/bacillus)\
**Post date:** [February 24, 2023, 3:35pm UTC](https://forums.sandisk.com/t/should-i-return-this-black-sn850x-drive-due-to-under-performance/267374/3 "2023-02-24T15:35:45Z")

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Yes I’ve opened a case four days ago Reference #: 230221-000210…

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**Author:** ![Raiden85OCUK](https://avatars.discourse-cdn.com/v4/letter/r/b5e925/32.png) [@Raiden85OCUK](https://forums.sandisk.com/u/Raiden85OCUK)\
**Post date:** [February 27, 2023, 11:24am UTC](https://forums.sandisk.com/t/should-i-return-this-black-sn850x-drive-due-to-under-performance/267374/4 "2023-02-27T11:24:45Z")

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Drive is more than likely fine, I find the As SSD benchmark tool to be a poor one for showing full drive speeds, best tool to use is CrystalDiskMark as this is a far more popular tool for benchmarking drives.

Here is my As SSD result

 ![Screenshot 2023-02-27 112116](https://global.discourse-cdn.com/sandisk/original/3X/7/5/75f0cf9efe771df33b875979f0565782fd97d844.jpeg)

And here is my CrystalDiskMark one, vastly different results, even Samsung’s own Magician tool does a better job showing the drives full speed than As SSD.

 ![WD SN850X 4TB](https://global.discourse-cdn.com/sandisk/original/3X/d/c/dc4968a9a0e9fd994a44c61eea1348dd571c3801.jpeg)