1TB Class Performance Testing
There is a lot to talk about today with three capacities to go over. We start with the 1TB models where the EX920 will go head-to-head with the Adata SX8200 using the same controller and flash. The SX8200 reserves more capacity for background tasks than the EX920 that gives users the full 1024GB of space.
The Intel 600p joins in the fun. This was the go to low cost 1TB SSD for much of 2017 and one of the few entry-level NVMe products to ship in this size. The Plextor M9Pe came to market around the same time. It features 64-layer memory but a first generation Marvell NVMe controller.
The two Samsung 970 SSDs featuring 64L V-NAND and the Phoenix controller, possibly the most advanced ever released for consumer SSDs, don't need an introduction. The EVO uses 3-bit per cell flash and the Pro uses 2-bit per cell flash.
The SanDisk Extreme Pro NVMe is actually the newest of the drives in the charts today. The Extreme Pro features Western Digital's first in-house NVMe controller with the company's 64L TLC.
Sequential Read Performance
The 1TB HP EX920 starts to read sequential 128KB block size data at over 2,000 MB/s. This is a very high number that is in the same realm as the two Samsung 970 series SSDs. The EX920 scales well as we increase the queue depth (QD) workload. At QD2 the drive is almost as fast as the 970 Pro.
Sequential Write Performance
Writing sequential data is a bit slower than reading it on the 1TB EX920. The drive turns in a quick performance but its around 1,000 MB/s slower than the two Samsung drives and the SanDisk Extreme Pro NVMe in the burst test.
Sustained Sequential Write Performance
The sustained write difference compared to the Adata SX8200 with overprovisioning. Adata takes the reserved space to give users more SLC buffer space and the EX920 just gives the space to users to keep data on. Both drives write a lot of data close to 1,500 MB/s in the buffer, but the HP has a higher native TLC speed.
Random Read Performance
The EX920 has the highest QD1 random read over any flash-based SSD we've tested. The Optane SSDs are faster but use an exotic memory that makes them expensive.
Random Write Performance
Like the sequential write test, the 1TB EX920 falls below many of the other drives in the random write test. This is less of a concern for users in the SLC buffer age because the drives are all so fast that it's difficult to see the differences in real-world use.
70% Read Sequential Performance
The EX920's lower sequential write performance doesn't allow the drive to reach the high mixed workload speeds in this test at moderate queue depths, but the drive dominates the QD2 test.
70% Read Random Performance
The 1TB EX920 also dominates the QD2 random mixed workload test thanks to the drive's blisteringly fast random read performance.
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