11/20/2023 0 Comments Raid 0 ssd benchmark![]() ![]() data and an IR thermometer to see when (or if) thermal throttling kicks in and how it impacts performance. We also monitor the drive’s temperature via the S.M.A.R.T. A drive might consume more power during any given workload, but accomplishing a task faster allows the drive to drop into an idle state faster, ultimately saving power. Average workload power consumption and max consumption are two other aspects of power consumption, but performance-per-watt is more important. Some SSDs can consume watts of power at idle, while better-suited ones sip just milliwatts. Idle power consumption is an important aspect to consider, especially if you're looking for a laptop upgrade. We use the Quarch HD Programmable Power Module to gain a deeper understanding of power characteristics. In contrast, drives like the WD Black SN850 and Sabrent Rocket 4 Plus consistently recovered tens to hundreds of gigabytes of their cache. But, when it came to cache recovery, the Samsung SSD recovered only its static SLC cache within our 30-min idle window. While it doesn’t have a massive SLC cache like the Sabrent or WD drives, the Samsung 980 Pro’s worst-case write performance was very good. After the TurboWrtite cache filled, write speeds degraded to approximately 1.5 GBps, but then ramped up to 2GBps, averaging 1.7 GBps until the device filled. At 2TB, the Samsung 980 Pro’s cache measured 238GB, writing at a speed of roughly 5.1GBps until full. ![]() However, because of the performance scaling issues present in our synthetic testing, we adjusted our settings to a 128KB block size here. We usually test the SLC cache, or in this case, TurboWrite, by writing to the SSD with a 1MB block size. 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, 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 Samsung’s Rocket 4 Plus displays some of the lowest-latency response in random write workloads, although the WD Black SN850 offers up both fast random read and write speeds across the board. However, it sustained speeds of over 5.2 GBps with 128KB blocks, exceeding its official rating.Īdditionally, the Samsung 980 Pro’s random read performance was the most impressive we’ve seen with a flash-based SSD, but its write performance could bear some improvement. The Samsung 980 Pro’s write performance shows less-than-optimal results with a 1MB block size, too, peaking at 4.5 GBps write. Peak read performance measured just 6.8 GBps with 1MB blocks but easily surpassed 7.1 GBps with 128KB blocks. The drive’s read performance suffered with large 1MB blocks, and this tendency carried over into our other synthetic testing. We tested Samsung’s 980 Pro at a QD of 1, representing most day to day file access at various block sizes, and while it was rather responsive with smaller files, it seems to suffer from a dip in performance as it scales up to larger block sizes.
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