nickfall
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RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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Another update: I ran CPU-Z, and the numbers are even worse. It looks like the CPU is throttled. I googled around, tried disabled SpeedStep, made sure the Power options do not set up CPU caps, etc. to no avail.

So it seems there is a multitude of problems here: slow-ish SSD, coupled with a throttled down i7 Smiley Sad

No idea what to do at this point.

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9 Rhodium

RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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DIsabling speedstep WILL throttle the CPU (it'll run as if on battery all the time).

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paaland
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RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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To further help anyone with this disk. Found out that Toshiba har rebranded this 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, and the NMVe driver. But still I don't get even close to expected performance.

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nickfall
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RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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I did re-enable SpeedStep, to no avail. Also re-tried the default BIOS settings.

See screenshots of CPU-Z. The core speed is stuck on 800 Mhz, no matter the workload put on the CPU.

Any possibility to set the speed of a core manually?

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simba2585
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RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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I did re-enable SpeedStep, to no avail. Also re-tried the default BIOS settings.

See screenshots of CPU-Z. The core speed is stuck on 800 Mhz, no matter the workload put on the CPU.

Any possibility to set the speed of a core manually?

have you double checked your power profile settings? for example the pci express power management settings and the cpu state settings? turn off the power management options and make sure the processor states have not been capped for min and max settings.

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paaland
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RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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Found out thatToshiba 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).

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nickfall
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RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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Do you mean the PCI Express Link State Power Management and Processor Power Management in the Windows Power Options panel? If so, yes, I used the High Performance plan and made sure the threshold are high and the the disabled the power savings for PCI express.

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nickfall
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RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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Paal: do you also have CPU speed issues with your Dell?

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paaland
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RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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No. But I had very poor write speed with the thnsn5512gpu7 NVMe PCIe SSD which this thread was originally about before you started discussing CPU issues as well.

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nickfall
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RE: Dell XPS 15 SSD NVMe slow after July 2016 firmware update

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@Paal: I marked your earlier answer (disable cache) as the best one since it best answers the title of this thread.

As for my original issue, it definitely is a combo SSD + CPU issue after the bios and/or Windows Anniversary update.

The CPU issue is unresolved, although I could temporarily mitigate it by disabled the BD_PROCHOT setting using ThrottleStop. Nothing else I tried has worked. I hope Microsoft and/or Dell will fix that issue in the future. (A bit of googling will let whoever has that issue learn what BD_PROCHOT is linked to, and realize than quite a few users have struggled with that issue in the past.)

Thanks all for your help.

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