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32 GiB write test

One of the main disadvantages of TLC Flash memories is its low write speed. Most SSDs that use this kind of memory compensates this by including in its controller chip a small amount of fast SLC Flash memory, acting as a write cache.  So, in these models, write operations with small amount of data are fast, because the data are stored in the SLC cache and later, when the drive is idle, the controller transfer them to the TLC memory chips. But when you write a big amount of data (more than the SLC cache), the speed drops significantly.

In order to benchmark it, we used CrystalDiskMark 5, on sequential write modes, with two repetitions and 32 GiB test file. Let’s check the results.

Kingston KC1000 480 GiB

On the sequential write and queue depth of 32, the Kingston KC1000 was 25% slower with 32 GiB than with 1 GiB.

Kingston KC1000 480 GiB

On the simple sequential write benchmark, the KC1000 480 GiB was 13% faster with 32 GiB than with an 1 GiB file.