ADATA XPG Gammix S70 Blade 8TB vs Western Digital WD_BLACK SN850X 8TB
At least one of these has no price the site currently tracks, so what follows weighs specifications alone.
| Specification | ADATAXPG Gammix S70 Blade 8TB | Western DigitalWD_BLACK SN850X 8TB |
|---|---|---|
| Capacity (GB) | 8000 | 8000 |
| Sequential read (MB/s) | 7400better | 7200 |
| Sequential write (MB/s) | 6800better | 6600 |
| Current best price | — | 1 420,65 €at Amazon.fr · captured 2026-09-13 |
| Price per TB | — | 177,58 € |
| Endurance (TBW) | 5920better | 4800 |
| Warranty (years) | 5 | 5 |
| DRAM cache | Yes | Yes |
| NAND type | tlc | tlc |
| Controller | InnoGrit IG5236 | Western Digital in-house 8-channel controller |
How these two compare
Sequential throughput
ADATA XPG Gammix S70 Blade 8TB states 7400 MB/s read and 6800 MB/s write; Western Digital WD_BLACK SN850X 8TB states 7200 MB/s read and 6600 MB/s write, both over PCIe. Sequential numbers like these describe large sustained transfers; the responsiveness you notice day to day tracks random access more closely than the peak figures do.
Endurance
ADATA XPG Gammix S70 Blade 8TB is rated for 5920 TBW and Western Digital WD_BLACK SN850X 8TB for 4800 TBW — the total the maker warrants you can write over the drive's life. A typical desktop writes only a few terabytes a year, so either rating is many years of headroom; the figure matters mainly as a relative signal of how hard each is built to be driven.
DRAM cache
On the cache question: ADATA XPG Gammix S70 Blade 8TB carries a DRAM cache, and Western Digital WD_BLACK SN850X 8TB carries a DRAM cache. The DRAM keeps the flash-translation table close, sparing a lookup on nearly every access; a drive without it leans on host memory or its own flash, which usually shows as slower sustained random writes rather than in the headline sequential numbers.
NAND, controller and warranty
On the flash itself: ADATA XPG Gammix S70 Blade 8TB uses TLC, and Western Digital WD_BLACK SN850X 8TB uses TLC. NAND tiers count bits per cell — more bits pack more capacity into the same silicon but shorten write endurance and slow sustained writes, which is why QLC sits below TLC on lasting performance even when the sequential numbers match. Controller: ADATA XPG Gammix S70 Blade 8TB uses the InnoGrit IG5236 and Western Digital WD_BLACK SN850X 8TB uses the Western Digital in-house 8-channel controller. The controller runs wear-levelling, error correction and the mapping table, so it shapes sustained and random behaviour as much as the flash does — though the model name alone predicts little without testing. ADATA XPG Gammix S70 Blade 8TB carries a 5-year warranty and Western Digital WD_BLACK SN850X 8TB carries a 5-year warranty — the length the maker will stand behind the drive, and usually a proxy for the endurance it is rated to.
Which to buy
The site holds no current price for at least one of these, so it cannot call the buy on cost. Judge them on the specifications above — at the same capacity and interface, two drives usually part on things like the DRAM cache, the NAND tier, endurance and warranty, so weigh whichever of those the sections above report.
Common questions about this pair
- Which is faster, ADATA XPG Gammix S70 Blade 8TB or Western Digital WD_BLACK SN850X 8TB?
- ADATA XPG Gammix S70 Blade 8TB states 7400 MB/s read and 6800 MB/s write; Western Digital WD_BLACK SN850X 8TB states 7200 MB/s read and 6600 MB/s write, both over PCIe. Sequential numbers like these describe large sustained transfers; the responsiveness you notice day to day tracks random access more closely than the peak figures do.
- Should you buy ADATA XPG Gammix S70 Blade 8TB or Western Digital WD_BLACK SN850X 8TB?
- The site holds no current price for at least one of these, so it cannot call the buy on cost. Judge them on the specifications above — at the same capacity and interface, two drives usually part on things like the DRAM cache, the NAND tier, endurance and warranty, so weigh whichever of those the sections above report.