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Old 07-02-21, 12:22 AM
FTLN FTLN is offline
OC3D Elite
Join Date: Feb 2012
Location: France
Posts: 1,739
Slow WD Black SN850

Hi All,

Anybody know why I'm hitting a wall on x570 with my new WD Black SN850 which is supposed to be faster than Samsung's 980 Pro ?


X570 Phantom Gaming-ITX/TB3
64Gb Corsair
RTX 3070
WD Black SN850 1Tb

Windows 10 freshly installed, latest drivers installed, latest bios installed and latest firmware on the NVME.

I have also installed heatsink on NVME to keep it nice and cool, it tops out at around 55c under load.


It seems I'm hitting a wall on write speeds although read should also be a bit higher.

3.13 GB/s Write

5.85 GB/s Read

Kit Gurus review of the drive shows that it should be hitting close to 5 GB/s on write and 6.5 GB/s on read https://www.kitguru.net/components/s...-ssd-review/5/

I have checked my bios on all seems to be configured correctly.

Aida64 show's drive running at Gen4 speeds

I have disabled power management PCI in power profile and have also turned of window write cache buffer flushing

Here is press release regarding this new NVME on WD website: https://www.westerndigital.com/compa...lack-portfolio

WD_BLACK SN850 NVMe SSD – Designed to feature the unprecedented performance of PCIe Gen4 technology, this future-ready product will deliver fast read/write speeds up to 7000/5300MB/s1 (1TB model). Built with the WD_BLACK G2 controller and optimized for top-tier and high-intensive gaming (not intended for NAS or server environments), the WD_BLACK SN850 NVMe SSD will help gamers achieve supreme PC performance. It reduces game load times and transfers files faster than its predecessor while using brand new cache technology3. In addition to high performance, the WD_BLACK SN850 NVMe SSD also delivers improved low queue-depth performance over its predecessor, allowing both gaming and everyday users to experience smoother loading of applications. And, for the ultimate in aesthetics and customization, there will be an optional RGB-enabled heatsink model that cuts down on thermal throttling. The WD_BLACK SN850 NVMe SSD non-heatsink version will be available in 500GB, 1TB and 2TB capacities2 starting at $149.99 (MSRP USD).

I'm at a loss as to what to do next ????
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