Adata XPG Mars 980 Blade 1TB VS Western Digital WD Black SN7100 4TB

Read speed is where these two drives diverge most dramatically. The Adata XPG Mars 980 Blade 1TB posts a sequential read of 14,000 MB/s against the Western Digital WD Black SN7100 4TB's 7,250 MB/s — nearly double the throughput. In practical terms, this gap matters most when moving very large files: transferring a 100 GB dataset, for instance, would complete in roughly half the time on the Adata drive.

The random read advantage follows the same pattern: 1,600,000 IOPS versus 900,000 IOPS. Random read performance governs how snappy a system feels during everyday use — loading applications, booting an OS, or handling database queries with many small, scattered file accesses. The Adata's roughly 78% higher IOPS count translates to noticeably more responsive behavior under these mixed, real-world workloads.

The read speed edge belongs unambiguously to the Adata XPG Mars 980 Blade across both sequential and random metrics. The WD Black SN7100 is by no means slow — 7,250 MB/s sequential is firmly high-end — but if raw read throughput and system responsiveness are the priority, the Adata is the clear winner in this category.

Write performance tells a similar story to read speed, with the Adata XPG Mars 980 Blade 1TB maintaining a commanding lead. Its sequential write of 10,000 MB/s outpaces the WD Black SN7100 4TB's 6,900 MB/s by around 45% — a gap that becomes very tangible when ingesting large volumes of data, such as capturing high-bitrate video footage, cloning drives, or writing large backups.

On the random write side, the margin narrows somewhat but remains meaningful: 1,650,000 IOPS for the Adata versus 1,350,000 IOPS for the WD Black — roughly a 22% difference. Random write IOPS governs performance under workloads that scatter small writes across the drive simultaneously, such as compiling code, running virtual machines, or operating a write-heavy database. The WD Black holds its own more credibly here than in sequential writes, but the Adata still has the upper hand.

Across both write metrics, the Adata XPG Mars 980 Blade takes the clear edge. That said, the WD Black SN7100's figures are genuinely strong in absolute terms — users whose workloads lean toward sustained sequential writes will feel the gap most acutely, while those doing lighter mixed writes may find the WD Black's numbers more than sufficient.

The architectural gap between these drives explains everything seen in their performance numbers. The Adata XPG Mars 980 Blade runs on PCIe 5.0 with NVMe 2.0 and a dedicated DRAM cache, backed by 8 controller channels — a top-tier configuration that doubles the interface bandwidth ceiling and gives the controller more parallelism to work with. The WD Black SN7100, by contrast, operates on PCIe 4.0 with NVMe 1.4 and relies on HMB (Host Memory Buffer), which borrows system RAM rather than carrying dedicated onboard cache. Under sustained or random-heavy workloads, HMB can introduce latency spikes that dedicated DRAM avoids entirely.

Capacity and endurance tell a different story, however. The WD Black ships at 4TB versus the Adata's 1TB, making it a fundamentally different proposition for storage-hungry users. More striking is the TBW gap: 2,400 TBW for the WD Black against 740 TBW for the Adata. This means the WD Black is rated to absorb more than three times the total write volume over its lifetime — highly relevant for workloads involving constant large writes, such as video editing archives or server logging. Both carry a 5-year warranty and use TLC NAND, so neither has a structural edge on longevity guarantees or cell-type efficiency.

There is no single winner here — the two drives are optimized for different priorities. The Adata's platform advantages make it the performance-first choice for users who can work within 1TB. The WD Black trades raw speed for vastly more capacity and endurance, positioning it as the more practical pick for high-volume storage over the long haul.