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Guru3d crystal diskmark5/7/2023 ![]() We hammer the SSDs with sequential writes for 15 minutes to measure both the size of the SLC buffer and performance after the buffer is saturated. Save (text) Save the result of benchmark to file (UTF-16LE w/ BOM). Sustained write speeds can suffer tremendously once the workload spills outside of the SLC cache and into the "native" TLC or QLC flash. CrystalDiskMark Main Menu File Copy Copy the result of benchmark to the clipboard. ![]() Most SSD makers implement an SLC cache buffer, which is a fast area of SLC-programmed flash that absorbs incoming data. Official write specifications are only part of the performance picture. Samsung rates the 970 EVO Plus’s performance at up to 19K/60K read/write IOPS at QD 1, but we only achieved 13K/47K IOPS in our system with the Meltdown and Spectre firmware and software patches applied. The EVO Plus does eke out a substantial lead over the rest of the test pool during the all-important random write test at QD1, which equates directly to system snappiness. For those penny pinchers on the hunt for a solid PCIe 3.0 x4 M.2 NVMe SSD, Samsung’s 980 is a good. The 970 EVO Plus has been far ahead of the standard 970 EVO in previous tests, but the EVO beats the Plus in the random write tests at a queue depth (QD) of 8. Samsung’s 500GB 980 is a very fast DRAM-less M.2 NVMe SSD that runs both cool and efficiently. The 970 EVO Plus outperforms the competition during sequential tests, but random read performance is another story.
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