ADATA likes to produce a broad range of SSDs, sampling from all the controller and NAND manufacturers. To that end, they have wholeheartedly embraced the use of 3D MLC NAND even as most brands are using the 3D NAND transition to entirely remove MLC from their consumer product lines or relegate it to niche models instead of treating it as the mainstream default. ADATA is selling multiple SATA and NVMe models using Micron's first-generation 3D MLC NAND. On the SATA side of things, they have the Ultimate SU900 and XPG SX950 as the MLC models (positioned above the SU800 and SU700 using 3D TLC). For the NVMe market, they have the XPG SX8000 and XPG SX9000 pairing 3D MLC with Silicon Motion and Marvell controllers respectively. So far, all of their 3D NAND SSDs have relied on Micron's first-generation 32-layer 3D NAND, the only 3D NAND available in volume on the open market.

The ADATA XPG SX950 is their top of the line SATA SSD. Technologically, it is very similar to their Ultimate SU900: both use the same Micron 3D MLC NAND and Silicon Motion SM2258 controller. The SX950 is distinguished by reserving more spare area (yielding usable capacities like 480GB instead of 512GB) and a six-year warranty instead of five. There may be significant firmware tuning differences, but there are no obvious signs such as one model providing TCG Opal encryption support (both lack that feature). ADATA did their own NAND packaging for the SX950, so it may be using flash binned for better endurance. The SU900 has a 2TB model listed but not yet available, while the SX950 line only goes up to 960GB, with limited availability of the largest model.

ADATA XPG SX950 Specifications
Capacity 240 GB 480 GB 960 GB
Model Number ASX950SS-240GM-C ASX950SS-480GM-C ASX950SS-960GM-C
Controller Silicon Motion SM2258
NAND Flash Micron 256Gbit 32-layer 3D MLC NAND
Sequential Read 560 MB/s
Sequential Write 520 MB/s 530 MB/s
Random Read IOPS 80k IOPS 90k IOPS 90k IOPS
Random Write IOPS 90k IOPS 90k IOPS 85k IOPS
TCG Opal Encryption No
Power Consumption Active: 0.82 W
Slumber: 0.41 W
Warranty 6 years
Write Endurance 200 TB 400 TB 800 TB
MSRP $139.99 $249.99 $449.99

The construction of the ADATA XPG SX950 is similar to ADATA's other recent SATA SSDs: a metal base and plastic lid are joined by a single screw through the center of the drive. The PCB occupies only half of the case, and has pads for eight NAND packages and two DRAM packages. On our 480GB sample, all eight NAND pads are occupied with dual-die packages, for a total raw capacity of 512GB.

Micron recently re-introduced MLC NAND to their consumer product line with the Crucial BX300, using their 32L 3D MLC and the SM2258 controller. The Crucial BX300 is positioned as more of an entry-level model, with a focus on lower capacities that cannot perform well when using their 3D TLC. The ADATA SX950 has twice the warranty period and up to five times the rated write endurance, but any performance differences will come down to firmware tweaks, and ADATA hasn't updated the firmware since the SX950 launched earlier this year. Current pricing for the SX950 shows that ADATA has not responded to the introduction of the BX300: for the two capacities where the models match up, the ADATA is more expensive by 25% and 45%. That's quite a premium for a longer warranty.

AnandTech 2017 SSD Testbed
CPU Intel Xeon E3 1240 v5
Motherboard ASRock Fatal1ty E3V5 Performance Gaming/OC
Chipset Intel C232
Memory 4x 8GB G.SKILL Ripjaws DDR4-2400 CL15
Graphics AMD Radeon HD 5450, 1920x1200@60Hz
Software Windows 10 x64, version 1703
Linux kernel version 4.12, fio version 2.21
AnandTech Storage Bench - The Destroyer
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  • CheapSushi - Tuesday, October 10, 2017 - link

    Next year with QLC it'll change. SATAIII is will still be useful for bulk drive SSDs coming. Yeah sure, if you're JUST a gamer and want only ONE drive for everything, it's a no-brainer on what direction to go. If you want just TWO drives, similar. But if you have more than that basic setup, SATAIII QLC SSDs are going to be perfect for bulk storage, while you have your OS and other main programs/software on an NVMe drive(s). Reply
  • MrSpadge - Monday, October 09, 2017 - link

    Billy, you need to be less honest with your titles if you want people to actually read your review ;) Reply
  • RaistlinZ - Monday, October 09, 2017 - link

    "In Search of Adequate" Reply
  • Lolimaster - Tuesday, October 10, 2017 - link

    Years later and still nothing can compete with the 850 EVO 500GB Reply
  • mapesdhs - Wednesday, October 11, 2017 - link

    This is how the exchange should go down when storage techs come up with a new SSD design and want approval to proceed:

    Tech: "We've designed a new SSD!"
    Manager: "Is it better than the 850 EVO?"
    Tech: "Umm, no."
    Manager: "Go away."
    Reply

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