[SOLVED] Poor write performances with Samsung 970 Evo Plus 500GB

[Kalilz]

Hello, I previously had a Samsung 970 Evo 250GB and upgraded to a Samsung 970 Evo Plus 500GB

And although the read speed is about what was promised, the write speed is strangely low, lower than with my old 970 250GB ?!
Samsung Magician detects it on PCIe Gen 3 x4 interface so there shouldn't be any issue ? I literally just switched off my computer, changed the M2 and started it to do the test...
of course doing the test in safe mode didn't change anything.
I also tried to reinstall the Samsung M2 drivers.

If you have any idea before I send it back to amazon 🙁 ...

Specs:
MB: Asus Z-170 Pro Gaming
CPU: Intel 6700K
RAM: 16GB

 

[Kalilz]

Problem solved !

FYI, those performances are what happen when you don't activate the write cache in windows.

 

[mdd1963]

(In case someone else sees this issue, was that setting within device manager/disk drives/970 EVO/policies ...was write caching not enabled by default?)

 

[Kalilz]

The setting can be found in the Device Manager > Disk Drives > (Open the disk) > Policies
It's prompted when creating the partition and the default is enabled, I removed it because I thought its purpose was to allow windows to write in the disk to store... I dunno windows things (didn't have my coffee)
Microsoft article: https://support.microsoft.com/en-us/help/324805/how-to-manually-turn-disk-write-caching-on-or-off
Another article because Microsoft FAQs url always change: https://www.tenforums.com/tutorials/21904-enable-disable-disk-write-caching-windows-10-a.html