data reported temperatures in the mid-50s (Celsius), our IR thermometer measured no more than 45C on the surface of the My Passport SSD after the device sustained well over 400GB of write transfers. This is due to their large dynamic cache capacity, but the My Passport takes the lead after writing 200GB of data thanks to its much better performance during sustained workloads. The Crucial X8 and Samsung T7 Touch get the jump on the My Passport when we first start to fill the drives. The small static cache recovers immediately after we stop writing data to the drive. After the SLC cache fills, write performance degrades to an average rate of 710 MBps until the drive is full. Like the standard Blue SN550, the Blue SN550E comes with a small static SLC cache that measures just 12GB on our 1TB sample. data and an IR thermometer to see when (or if) thermal throttling kicks in and how it impacts performance. We also monitor cache recovery via multiple idle rounds and the temperature of the drive via the S.M.A.R.T. 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, a fast area of (usually) pseudo-SLC programmed flash that absorbs incoming data. Official write specifications are only part of the performance picture. Write speed and temperature are two important and inter-related metrics for external devices. Sustained Write Performance, Cache Recovery, & Temperature The Crucial SSD packs QLC flash that has a reputation for slower performance, but thanks to its DRAM-based architecture, it processes random read requests nearly twice as fast as the My Passport.
The WD responds much faster to random requests than Samsung’s T7 Touch, but the Crucial X8 is faster. The My Passport SSD doesn't quite hit its rated specs when we scale up the QD to see how the drive responds during heavier workloads. However, the WD My Passport SSD is faster with small files than the Samsung T7 Touch. The My Passport’s sequential performance at a QD (queue depth) of 1, which represents the most common data accesses in operating systems, is in line with most of its competition.
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