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Silver 2.5 inch SSD with Western Digital Ultrastar DC SN640 label

Western Digital

Western Digital Ultrastar DC SN640 7.68TB PCIe 3.1 NVMe 2.5" internal SSD

SKU CH-W82F-8E2F3

A 7.68 TB 2.5″ internal NVMe SSD delivering up to 3100 MBps read and 1800 MBps write over PCIe 3.1

  • Total capacity7.68 TB
  • Sequential read speedUp to 3,100 MB/s
  • Sequential write speedUp to 1,800 MB/s
  • Interface typePCI Express 3.1 x4 NVMe
  • Form factor2.5 in (6.35 cm)
  • Product typeInternal Solid State Drive (SSD)
  • 68TB capacity stores massive datasets in one drive
  • PCIe 3.1 x4 NVMe interface delivers 3100 MBps sequential read speed
  • 467000 IOPS random read accelerates database and virtualization workloads
  • 1800 MBps sequential write sustains heavy ingest pipelines
  • 5" form factor fits standard enterprise drive bays

Enterprise capacity for data centres

The Western Digital Ultrastar DC SN640 provides 7.68TB of storage in a 2.5 inch form factor. It connects through a PCI Express 3.1 x4 NVMe interface. The drive is built for servers and storage arrays that need high capacity and consistent throughput.

Thermal envelope and power profile

The component operates between 0°C and 70°C under normal workloads. Sequential reads reach up to 3100 MBps while sequential writes reach up to 1800 MBps. Random read performance hits 467000 IOPS and random writes hit 65000 IOPS within this temperature range.

Behaviour under sustained load

The SSD maintains its rated speeds during extended transfers rather than only in short bursts. Steady state random reads stay at 467000 IOPS and writes at 65000 IOPS. The PCIe 3.1 x4 NVMe link keeps latency predictable for database and virtualisation tasks.

How it compares

Measured against everything we stock in Internal NVMe & SATA SSDs, at today’s prices. Recalculated every night.

Price $1,051.99
Pricier than about 90% of the 1,994 comparable items (median $180.49).
Total capacity 7.68 TB
Higher than about 93% of the 1,368 comparable items (median 1 TB).
Sequential read speed Up to 3,100 MB/s
Higher than about 56% of the 1,180 comparable items (median 2,400 MB/s).
Price per TB $136.98 per TB
Cheaper than about 64% of the 1,362 comparable items (median $165.50 per TB).

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Specifications

Product
Brand nameWestern Digital
Part numberWUS4BB076D7P3E3
Total capacity7.68 TB
Product typeInternal Solid State Drive (SSD)
Performance
Sequential read speedUp to 3,100 MB/s
Sequential write speedUp to 1,800 MB/s
Random read (4K)Up to 467,000 IOPS
Random write (4K)Up to 65,000 IOPS
Ports & slots
Interface typePCI Express 3.1 x4 NVMe
Size & build
Form factor2.5 in (6.35 cm)
Environment & compliance
Operating temperature range0 °C to 70 °C

Questions about this item

Will this 2.5" drive fit in a standard 2.5" U.2 hot-swap bay?

The drive uses a 2.5" form factor with a PCIe 3.1 x4 NVMe interface, matching the physical and electrical requirements of U.2 bays designed for NVMe SSDs.

What workloads can the 467000 random read IOPS and 65000 random write IOPS actually handle?

Those figures support heavy read-centric workloads such as database indexing, virtualisation hosts and content-delivery caches where low-latency random access matters most.

Does the 70 °C operating limit require extra cooling in a 1U server?

The drive is rated for 0 °C to 70 °C; in a 1U chassis ensure airflow keeps the drive surface below 70 °C under sustained write loads of up to 1800 MBps.

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