The Western Digital WD Blue SN500 SSD Review: Moving The Mainstream To NVMeby Billy Tallis on April 19, 2019 9:30 AM EST
AnandTech Storage Bench - The Destroyer
The Destroyer is an extremely long test replicating the access patterns of very IO-intensive desktop usage. A detailed breakdown can be found in this article. Like real-world usage, the drives do get the occasional break that allows for some background garbage collection and flushing caches, but those idle times are limited to 25ms so that it doesn't take all week to run the test. These AnandTech Storage Bench (ATSB) tests do not involve running the actual applications that generated the workloads, so the scores are relatively insensitive to changes in CPU performance and RAM from our new testbed, but the jump to a newer version of Windows and the newer storage drivers can have an impact.
We quantify performance on this test by reporting the drive's average data throughput, the average latency of the I/O operations, and the total energy used by the drive over the course of the test.
The average data rate of the WD Blue SN500 on The Destroyer puts it in a tie with the ADATA SX8200 and ahead of other entry-level NVMe drives. The 250GB SN500 outperforms even the 1TB SATA WD Blue SSD and the 1TB QLC-based Intel 660p. Samsung's 970 EVO Plus is significantly faster overall, but that's to be expected considering there is no more high-end option in this capacity class.
The great average and 99th percentile latency scores from the WD Blue SN500 on The Destroyer make it easy to forget that the SN500 is designed to be an entry-level NVMe drive, not a flagship high-end product (to the extent that such a thing is possible with TLC NAND in such small quantities).
The average read latency of the WD Blue SN500 on The Destroyer is faster than any other drive in its capacity class, and only 60% slower than the Intel Optane 800p. The average write latency doesn't stand out much from the competition, but the SN500 is still behaving more like a high-end drive rather than showing any of the acute weaknesses often found in entry-level products.
The 99th percentile read and write latency scores from the SN500 are similarly excellent, and better than can reasonably be expected from a DRAMless SSD that we know is doing a lot of background garbage collection during this test.
The WD Blue SN500 was quite power efficient during The Destroyer; despite being significantly slower overall than the WD Black SN750, the SN500 used a bit less energy in total. The other drives in its capacity class all used at least 50% more energy to complete this test, and the Toshiba RC100 despite seeming most similar at a high level (DRAMless, TLC, NVMe) took several times longer to run the test and used several times the energy.