The ADATA XPG SX8200 & GAMMIX S11 NVMe SSD Review: High Performance At All Sizesby Billy Tallis on July 25, 2018 11:00 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 performance of the ADATA drives on The Destroyer is about as expected given how the other SM2262 drives behave: The average data rates are significantly lower than most of the other recent high-end SSDs. The SX8200 and GAMMIX S11 with 64L 3D TLC and a newer controller perform about as well as the older SX8000 with 32L MLC and the slower SM2260 controller, while the older TLC-based GAMMIX S10 sits at the bottom of the chart. It is interesting that the Intel 760p with very similar hardware shows much greater variation in performance between capacities than the SX8200. Whatever customizations Intel has made to the SM2262 platform are helping their 512GB model but hurting the 256GB model.
The SX8200 and GAMMIX S11 can't match the latency of the MLC-based SX8000 on The Destroyer, with a small disadvantage in average latency and much worse 99th percentile latency. Compared to the previous-generation TLC drive, things are greatly improved to the point that the 240GB SX8200 has lower latency than the 512GB GAMMIX S10.
Differences in drive capacity seem to have a much bigger effect on the SX8200's average write latency than the average read latency. However, it's on the read side that the latency of the SX8200 stands out as clearly worse than other current competitors like the Samsung 970 EVO. The poor write latency of the TLC-based GAMMIX S10 has been thoroughly addressed by the new drives, with a factor of four improvement.
The older SM2260 SSDs with MLC or TLC have much better 99th percentile read latencies than the newer ADATA drives with the SM2262 controller. Average latency for the TLC-based drives is vastly better with the newer generation, but some consistency has been sacrificed. The 99th percentile write latency hasn't changed much, and the MLC-based SX8000 still has a clear advantage there despite using the older controller and NAND.
The SX8200 and GAMMIX S11 use a bit more energy than their predecessors to complete The Destroyer, but this isn't too surprising–it's often necessary to sacrifice some efficiency to get better performance, and The Destroyer is quite a bit more intense than the workloads that the newer ADATA drives are optimized for.