Toshiba has announced a new variant of their XG6 client NVMe SSD: the XG6-P that adds a 2TB option to the family. The previous XG5 generation of SSDs followed the same pattern, with the initial version offering mainstream capacities up to 1TB, and the later -P version offering just higher capacities with tuned firmware for better performance on heavier workloads. When the XG6 launched, its performance was enough to render the 1TB XG5-P obsolete, but the 2TB XG5-P didn't have a proper successor until now.
The XG6-P doesn't bring any improvement to the top-line performance numbers compared to the original XG6. While the XG6 and XG6-P are both quite modern in their use of 96-layer 3D NAND, they are still using the same controller as the XG5 family, and there doesn't seem to be much room to squeeze more performance out of that chip. However, like the XG5-P, the XG6-P can be expected to offer some improvements for use cases that aren't quantified on the spec sheet, such as write performance after the SLC cache is filled.
| Toshiba Client OEM NVMe SSD Comparison | |||||
| Model | XG6-P | XG6 | XG5 | XG5-P | |
| Capacities | up to 2TB | 256GB, 512GB, 1024GB | 1TB, 2TB | ||
| Form Factor | M.2 2280 | ||||
| Host Interface | PCIe 3.1 x4 | ||||
| Protocol | NVMe 1.3a | NVMe 1.2.1 | |||
| NAND Flash | Toshiba 96L BiCS4 3D TLC | Toshiba 64L BiCS3 3D TLC | |||
| Sequential Read | 3180 MB/s | 3180 MB/s | 3000 MB/s | 3000 MB/s | |
| Sequential Write | 2920 MB/s | 2960 MB/s | 2100 MB/s | 2200 MB/s | |
| Random Read | 355k IOPS | 355k IOPS | 320k IOPS | ||
| Random Write | 365k IOPS | 365k IOPS | 265k IOPS | ||
| Power | Read | < 5 W | 4.2 W | 4.5 W | 4.9 W |
| Write | 4.7 W | 3.4 W | |||
| Idle | 3 mW | 3 mW | 3 mW | 3 mW | |
| TCG Opal Encryption | Optional | ||||
| Announced | May 2019 | July 2018 | November 2017 | May 2017 | |
Toshiba's XG family of SSDs are OEM-only products intended for high-end client and entry-level datacenter usage (eg. server boot and logging), while their BG series covers more mainstream segments and was significantly updated earlier this year with the BG4. Toshiba has not released a retail counterpart to an XG series since the XG3 was adapted into the Toshiba OCZ RD400 in 2016. The XG5-P will start sampling next month, so it should start showing up in notebooks this fall.
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