Samsung’s 980 displays solid write performance out of the gate, even scoring second place with a solid 3 GBps average until after the one-minute mark. We also monitor cache recovery via multiple idle rounds. We use iometer to hammer the SSD with sequential writes for 15 minutes to measure both the size of the write cache and performance after the cache is saturated. Sustained write speeds can suffer tremendously once the workload spills outside of the cache and into the "native" TLC or QLC flash. Most SSDs implement a write cache, which is a fast area of (usually) pseudo-SLC programmed flash that absorbs incoming data. Official write specifications are only part of the performance picture. Sustained Write Performance and Cache Recovery In fact, it's nearly on par with the SK hynix Gold P31.
The Samsung 980 takes third place in the 4K random read test, beating many DRAM-based competitors. Peak sequential read/write speeds exceed 3.5/2.8 GBps, with write performance being just shy of the official rating.Īs you can tell from the application results above, the 980’s random performance is solid, too. The 980 offers up fairly responsive sequential performance at a queue depth (QD) of 1, but we see a dip in read performance around the 128KB-1MB file sizes.
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