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Posts: 45
Registered: ‎04-17-2010
Location: Norway
Message 1 of 6 (2,841 Views)

X1 Carbon 2016 (20FB) - Very slow SSD write speeds

Just got my brand new X1 Carbon (4gen 2016/20FB) with the 512 GB PCIe NVMe SSD (THNSN5512GPU7). Was expecting a blazing fast disk, but it felt sluggish something that AS SSD Benchmark confirms (see attachment).

 

According to the specs this drive should offer up to 2400 Mb/s read and 1500 Mb/s write. But I get 1800 MB/s read and abysmal 113 MB/s write.

 

The machine has all the latest updates from Lenovo (incl BIOS) and all the drivers for Windows 10. Anyone else tested their drives?

 

Found a Dell XPS owner with the same drive that complained about the same issue. Turning off windows write cache buffer flushing does help, but that is not a good answer.

Guru
Posts: 254
Registered: ‎09-04-2012
Location: DE
Message 2 of 6 (2,829 Views)

Re: X1 Carbon 2016 (20FB) - Very slow SSD write speeds

[ Edited ]

Did you already try to install the Samsung NVMe driver?

 

Sorry, I didn't notice that your machine is equipped with a Toshiba NVMe SSD. Apparently, the Microsoft NVMe driver causes this issue as "all write operations are enforced to be written not only on a cache but on the non-volatile media. This is different from how AHCI was implemented and will lead to reduced performance. The benefit of the implementation with Microsoft NVMe driver is that it keeps your data safe in case of power outage or system crash." (from http://www.futuremark.com/support/pcmark8).

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Posts: 45
Registered: ‎04-17-2010
Location: Norway
Message 3 of 6 (2,826 Views)

Re: X1 Carbon 2016 (20FB) - Very slow SSD write speeds

No. Can I run the Samsung driver on a Toshiba NVMe SSD?
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Posts: 45
Registered: ‎04-17-2010
Location: Norway
Message 4 of 6 (2,823 Views)

Re: X1 Carbon 2016 (20FB) - Very slow SSD write speeds

[ Edited ]

To answher that myself. "Samsung NVM Express Device is not connected.". My X1 Carbon came with the Toshiba THNSN5512GPU7 drive.

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Posts: 45
Registered: ‎04-17-2010
Location: Norway
Message 5 of 6 (2,816 Views)

Re: X1 Carbon 2016 (20FB) - Very slow SSD write speeds

[ Edited ]

To further help anyone with this disk. Found out that Toshiba has rebranded this drive as OCZ RD400/400A and that both firmware utility and NVMe drivers are available to download here: http://ocz.com/eu/download/

 

Installed both the SSD utility that claims the firmware is up to date. Also installed the NMVe driver. But still I don't get even close to expected performance.

 

Read more about the drive here: http://www.tomshardware.com/reviews/toshiba-xg3-ssd-ocz-revodrive-400,4434.html

(Toshiba bought OCZ back in 2014 and apparently some drives are sold under the Toshiba name and some as OCZ). 

Former Employee
Posts: 1,664
Registered: ‎09-16-2014
Location: US
Message 6 of 6 (2,629 Views)

Re: X1 Carbon 2016 (20FB) - Very slow SSD write speeds

Think Engineering investigated slow SSD write speed you described and found that AD SSD Benchmark exhibited problems when benchmarking NVMe drives. More information can be found here: http://www.overclock.net/t/1576967/samsung-sm951-nvme-256gb-m2-as-ssd-benchmark-issue-z170-deluxe

 

They recommend using CrystalDiskMark v 5.1.2. or later for Speed analysis.

 

Thank you,

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