Fast read but slow writes? kingston SSD V300

meat_loaf · Mar 30, 2017

Based on what kingston brochure has stated that the avg read speed can reach up to 450 mb/s and same for write speed on Sata 3.

However, my SSD tested on AS SSD benchmark the avg read speed is great getting 400 mb/s but the write speed is very slow avg only 135 mb/s. This is like Sata 2 write speed.

I have Asrock Z170-X1 with a i5 6500. All the Sata ports are 6 gb/s. Any ideas why the write speed is sub par?

jrrdmchls · Mar 30, 2017

Go to Device Manager in Windows and click Disk drives.
Right-click on your SSD and select "Properties".
Click on the Policies tab.
If "Enable write caching on the device" is checked, uncheck it, click OK, check it, click OK.
Re-run your benchmark and see if that helps.

Also make use your drivers are up to date.

jasonkaler · Mar 30, 2017

meat_loaf :

The datasheet (https://www.kingston.com/datasheets/sv300s3_us.pdf) specifies:
"120GB — 180MB/s Read and 133MB/s Write"

meat_loaf · Mar 30, 2017

jasonkaler :

If its stating AS SSD benchmark thats not very correct. Because the read speed is way above the the rated 180 mb/s read since it actually reads at 400 mb/s + based on multiple AS SSD benchmarking.

meat_loaf · Mar 30, 2017

jrrdmchls :

Disabling that options improves the read speed upt to 440 mb/s but write speed wavers between 125 mb/s - 140 mb/s which is barely an improvement on that end.

jasonkaler · Apr 3, 2017

meat_loaf :

That speed quoted is the uncompressed data speed and thus the actual performance of the flash.
If it's performing faster than that in benchmarks, it's because of compression and cacheing in the device which reduce physical reads and writes thus improving performance.

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