TurboVS
Lexar NM990 2TB
Western Digital WD Black SN8100 4TB

Lexar NM990 2TB Western Digital WD Black SN8100 4TB

Common Features

  • ✓ Both products are M2 type SSDs.
  • ✓ Both products have a DRAM cache.
  • ✓ Both products are NVMe SSDs.
  • ✓ Both products support PCI Express (PCIe) version 5.
  • ✓ Both products have 8 controller channels.
  • ✓ Both products come with a 5-year warranty period.
  • ✓ Neither product has an integrated heatsink.
  • ✓ Neither product has RGB lighting.

Main Differences

  • • Sequential read speed is 14000 MB/s on Lexar NM990 2TB and 14900 MB/s on Western Digital WD Black SN8100 4TB.
  • • Random read speed is 2000000 IOPS on Lexar NM990 2TB and 2300000 IOPS on Western Digital WD Black SN8100 4TB.
  • • Sequential write speed is 10000 MB/s on Lexar NM990 2TB and 14000 MB/s on Western Digital WD Black SN8100 4TB.
  • • Random write speed is 1400000 IOPS on Lexar NM990 2TB and 2400000 IOPS on Western Digital WD Black SN8100 4TB.
  • • PassMark result is 72310 on Lexar NM990 2TB and 90689 on Western Digital WD Black SN8100 4TB.
  • • Internal storage is 2000GB on Lexar NM990 2TB and 4000GB on Western Digital WD Black SN8100 4TB.
  • • Terabytes Written (TBW) is 1500 on Lexar NM990 2TB and 2400 on Western Digital WD Black SN8100 4TB.
Specs Comparison
Lexar NM990 2TB

Lexar NM990 2TB

Western Digital WD Black SN8100 4TB

Western Digital WD Black SN8100 4TB

Read speed:
sequential read speed 14000 MB/s 14900 MB/s
random read speed 2000000 IOPS 2300000 IOPS

The Lexar NM990 2TB offers a sequential read speed of 14000 MB/s, while the Western Digital WD Black SN8100 4TB delivers a slightly higher sequential read speed of 14900 MB/s. This makes the WD Black SN8100 marginally faster in sequential reads, with a 900 MB/s difference.

Both products excel in random read performance. The Lexar NM990 reaches 2000000 IOPS, while the Western Digital WD Black SN8100 achieves 2300000 IOPS. The WD Black SN8100 again leads by 300000 IOPS in random read speed.

Overall, the differences in read speeds are relatively small, with the WD Black SN8100 showing a slight edge in both sequential and random read benchmarks compared to the Lexar NM990.

Write speed:
sequential write speed 10000 MB/s 14000 MB/s
random write speed 1400000 IOPS 2400000 IOPS

The Lexar NM990 2TB offers a sequential write speed of 10000 MB/s, while the Western Digital WD Black SN8100 4TB achieves a higher sequential write speed of 14000 MB/s. This gives the WD Black SN8100 a 4000 MB/s advantage in sequential write performance.

In terms of random write speeds, the Lexar NM990 reaches 1400000 IOPS, whereas the Western Digital WD Black SN8100 is faster, with a random write speed of 2400000 IOPS. This results in a 1000000 IOPS difference between the two products in random write performance.

Overall, the WD Black SN8100 outperforms the Lexar NM990 in both sequential and random write speeds by a noticeable margin.

Benchmarks:
PassMark result 72310 90689

The Lexar NM990 2TB has a PassMark result of 72310, while the Western Digital WD Black SN8100 4TB performs better with a PassMark result of 90689. This shows a significant performance difference between the two, with the WD Black SN8100 achieving a higher score by 18379 points.

Both products have a recorded PassMark result, but the WD Black SN8100 clearly surpasses the Lexar NM990 in this benchmark.

This comparison highlights that the Western Digital WD Black SN8100 has a stronger overall benchmark score than the Lexar NM990.

General info:
type M2 M2
SSD cache DRAM cache DRAM cache
Is an NVMe SSD ✓ ✓
internal storage 2000GB 4000GB
release date June 2025 May 2025
PCI Express (PCIe) version 5 5
Controller channels 8 8
Terabytes Written (TBW) 1500 2400
warranty period 5 years 5 years
Has an integrated heatsink ✕ ✕
has RGB lighting ✕ ✕

Both the Lexar NM990 2TB and the Western Digital WD Black SN8100 4TB are M.2 NVMe SSDs with DRAM caches. They both use PCIe 5.0 and have 8 controller channels, ensuring fast data throughput. However, there are notable differences in their storage capacities. The Lexar NM990 offers 2000GB of internal storage, while the WD Black SN8100 provides double that at 4000GB.

In terms of durability, the Lexar NM990 has a Terabytes Written (TBW) rating of 1500, while the WD Black SN8100 offers a higher TBW rating of 2400, meaning the WD model can handle more data writing over its lifetime.

Both products come with a 5-year warranty and neither includes an integrated heatsink or RGB lighting, making their external features quite similar in these areas.

Comparison Summary

This is a specification comparison between Lexar NM990 2TB and Western Digital WD Black SN8100 4TB. Both products are M2 type SSDs with DRAM cache, PCIe version 5, and 5-year warranty periods. They also lack an integrated heatsink and RGB lighting. The main differences include the sequential read speed (14000 MB/s on Lexar NM990 2TB and 14900 MB/s on Western Digital WD Black SN8100 4TB), sequential write speed (10000 MB/s on Lexar NM990 2TB and 14000 MB/s on Western Digital WD Black SN8100 4TB), internal storage (2000GB on Lexar NM990 2TB and 4000GB on Western Digital WD Black SN8100 4TB), and PassMark result (72310 on Lexar NM990 2TB and 90689 on Western Digital WD Black SN8100 4TB). Additionally, the Terabytes Written is 1500 on Lexar NM990 2TB and 2400 on Western Digital WD Black SN8100 4TB.