345-BJJY Dell 7.68TB PCI-E Gen 4.0 X4 NVMe Read Intensive TLC SSD.

Dell 345-BJJY — Enterprise 7.68TB U.2 NVMe SSD (PCIe Gen4 x4)

The Dell 345-BJJY is a high-capacity, enterprise-grade internal solid state drive engineered for read-intensive applications. Built in a 2.5-inch U.2 15mm form factor and leveraging PCIe 4.0 x4 NVMe, this 7.68TB SSD pairs dense storage with data-center reliability and 1DWPD endurance for consistent performance under heavy read workloads.

Core specifications

• Manufacturer: Dell
• Part number / SKU: 345-BJJY
• Device type: Internal Solid State Drive (SSD)
• Capacity: 7.68 TB
• Interface: PCI Express 4.0 x4 (NVMe)
• Form factor: U.2, 2.5-inch, 15 mm
• Endurance: Read-intensive workload rating (1DWPD)

Performance and endurance profile

Optimized for read-intensive use, the 345-BJJY balances large capacity with a write endurance suited to mostly-read datasets. The NVMe over PCIe Gen4 x4 connection maximizes bandwidth for sequential and random reads, helping latency-sensitive applications respond faster and sustaining heavy read operations typical of enterprise deployments. The specified 1DWPD endurance indicates a design focus on longevity for read-dominant workloads.

Form factor and connectivity details

• U.2 (2.5-inch, 15mm) for rack and blade server bays.
• PCIe Gen4 x4 NVMe interface—two NVMe lanes accessible through compatible backplanes.
• Fits a single internal 2.5in bay; supports hot-swap when paired with compatible servers.

Compatibility — Tested Dell PowerEdge systems

The 345-BJJY is validated for a wide range of Dell PowerEdge platforms. Below are servers commonly used in enterprise fleets where this SSD can be deployed reliably:

• PowerEdge C6420, C6525, C6620
• PowerEdge R440, R640, R740xd, R840, R940, R940xa, R960
• PowerEdge R6415, R6515, R6615, R6715, R7615
• PowerEdge R6525, R6625, R7425, R7525, R7625
• PowerEdge R660xs, R670, R760, R760xa
• PowerEdge R770, R770 (dense compute), R840 variants
• PowerEdge R7415, R7515
• PowerEdge T560, XE9640, XE9680, XR7620

Dell 345-BJJY — High-Capacity U.2 NVMe SSD for PowerEdge Servers

The Dell 345-BJJY 7.68TB PCIe Gen 4.0 x4 NVMe U.2 2.5" Read-Intensive TLC 1DWPD Enterprise Internal SSD is engineered for datacenter workloads that demand large capacity, low latency, and consistent read performance. Designed as a direct-fit storage option for Dell PowerEdge 14G, 15G, 16G and 17G servers, this drive targets read-heavy applications such as virtualization boot volumes, content delivery, database reads, analytics, and large-scale web and object storage layers.

Key Features & Highlights

• Form factor: U.2 2.5-inch Small Form Factor (SSF) — standardized for enterprise server bays and hot-swap enclosures.
• Interface: PCIe Gen 4.0 x4 NVMe — delivers high throughput and reduced protocol overhead compared to SATA and SAS.
• Capacity: 7.68TB — high-density single-drive storage for consolidation and reduced rack footprint.
• Flash Type: 3D TLC (Triple-Level Cell) optimized for read-intensive workloads.
• Endurance: Rated at 1 DWPD (Drive Write Per Day) — suitable for predominantly read workloads while maintaining enterprise endurance guarantees.
• Optimized for Dell PowerEdge: Qualified and supported in Dell PowerEdge 14G–17G platforms for firmware compatibility and lifecycle management.
• Enterprise readiness: Power-loss protection, end-to-end data protection, and advanced SMART reporting.

Performance Characteristics

Throughput and IOPS

The PCIe Gen 4.0 x4 interface doubles the per-lane bandwidth compared to Gen 3, giving enterprise NVMe media much greater headroom for sustained throughput and higher IOPS. For read-heavy datasets — such as analytics queries, VM boot storms, or content distribution — the Dell 345-BJJY provides:

• Very high sequential read rates, ideal for streaming and bulk data retrieval.
• Strong random read IOPS for metadata-heavy workloads, small-file access, and database index reads.
• Low and consistent tail latency, reducing worst-case response times that impact application SLAs.

Latency & QoS

NVMe’s lightweight command set and native queuing architecture help drive down request latency. The Dell 345-BJJY leverages controller optimizations and enterprise firmware to deliver consistent latency under sustained loads — a critical metric for multi-tenant virtualization and latency-sensitive services.

Design & Durability

Endurance Rating: 1 DWPD

The specified endurance of 1 Drive-Write-Per-Day indicates the drive can sustain full-capacity writes equivalent to its capacity once per day over its warranty term without exceeding design stress limits. For most read-intensive environments this margin provides robust longevity and predictable replacement cycles.

Power-Loss & Data Protection

Enterprise NVMe drives include features to safeguard data in case of sudden power loss. The Dell 345-BJJY incorporates:

• Power-loss protection capacitors or controller-level mechanisms to flush volatile caches to non-volatile flash.
• End-to-end data path protection to detect and mitigate transmission errors between host and media.
• Comprehensive SMART and telemetry data for early warning of failing media.

Thermal Management

2.5" U.2 SSDs are compact but can run warm under sustained activity. Ensure your PowerEdge server’s airflow and drive bay cooling meet Dell’s guidelines. Many drives include thermal throttling to protect data integrity — but for best performance, maintain recommended inlet temperatures and unobstructed cooling paths.

Use Cases & Deployment Scenarios

Virtualization & VDI

Virtual Desktop Infrastructure and multi-VM hosts benefit from the Dell 345-BJJY’s low-latency reads and high IOPS for boot storms, user profile access, and application launches. Using NVMe boot volumes or caching tiers can dramatically shorten VM startup times and improve user experience.

Database & Analytics

Read-dominant database workloads — such as reporting queries, read replicas, and OLAP scans — gain a performance uplift from high sustained read throughput. The 7.68TB capacity allows large datasets to remain on fast media, reducing the need to tier frequently accessed data to slower pools.

Content Delivery & Media Streaming

For content repositories, object stores, and streaming services that serve heavy read traffic, large NVMe drives reduce the number of drives required and simplify capacity planning. Consolidating popular content on high-capacity NVMe lowers the mechanical failure surface area and improves delivery consistency.

Cache/Tiering Layer

Use the Dell 345-BJJY as a cache layer in hybrid storage architectures — fronting slower HDD arrays with an NVMe layer that accelerates read operations and caches hot datasets for immediate delivery.

Storage Architecture & Best Practices

RAID & NVMe Considerations

NVMe drives are increasingly used in RAID configurations with software-defined or hardware RAID solutions designed for NVMe. When designing arrays:

• Evaluate RAID level carefully: read-heavy applications may benefit from RAID 6 for redundancy, but RAID 10 can deliver better write and rebuild performance for mixed workloads.
• Consider NVMe RAID controllers and software stacks that are explicitly NVMe-aware to avoid performance pitfalls.
• Plan rebuild times and degraded-mode performance — high-capacity drives can lengthen rebuild windows, increasing exposure to subsequent failures unless mitigated by hot spares or rapid replacement policies.

Over-Provisioning & QoS

Enterprise SSD vendors often reserve some capacity (over-provisioning) to improve sustained performance and endurance. When configuring, allow room for background maintenance tasks and reserve spare capacity to maintain consistent QoS under heavy loads.

Monitoring & Telemetry

Active health monitoring is essential. Integrate SMART telemetry, NVMe health logs, and Dell OpenManage alerts into your monitoring stack to track wear levels, error rates, and temperature anomalies. Early detection enables planned maintenance instead of reactive replacements.

Comparisons & Alternatives

NVMe U.2 vs M.2 vs EDSFF

• U.2 (2.5") — enterprise-friendly, hot-swap, broad chassis compatibility; ideal when existing server bays or drive trays are 2.5" form factor.
• M.2 — compact and cost-efficient for single-drive use but less suitable for hot-swap enterprise deployments and limited capacity options.
• EDSFF — newer server-optimized form factors (like E1.S, E3) offering higher densities and advanced cooling; great for next-gen servers but may lack broad legacy chassis compatibility.

Read-Intensive TLC vs Mixed-Use / Endurance Drives

Read-intensive TLC drives provide a strong capacity/price balance. For write-heavy transactional workloads (e.g., intensive OLTP), consider drives rated for higher DWPD or enterprise SLC/MLC alternatives. Match the endurance rating to the expected write profile to avoid premature wear and unexpected replacements.

Procurement & Total Cost of Ownership (TCO)

Capacity Planning

When planning capacity, account for over-provisioning, RAID overhead, and future growth. Large single-drive capacities like 7.68TB simplify rack design and reduce the number of drives required, which can lower power, cooling, and service costs.

Power & Cooling Impact

SSD arrays consume less power than equivalent HDD capacity, but NVMe drives under heavy load can still draw significant power. Factor in peak power draw and thermal dissipation when sizing power supplies and cooling systems.

Replacement Cycles

Use SMART telemetry and wear metrics to plan drive refresh cycles. Because TLC media has limited program/erase cycles compared to SLC/MLC, proactive lifecycle management ensures predictable budgeting and minimal downtime.

Conclusion of Product Section (Content Body Only — No Intro/Outro)

The Dell 345-BJJY 7.68TB PCIe Gen 4 x4 NVMe U.2 2.5" Read-Intensive TLC SSD is a strategic choice for organizations seeking dense, high-performance read storage within Dell PowerEdge environments. It balances cost, capacity, and enterprise reliability while integrating into Dell’s management ecosystem for lifecycle control. Whether used as primary read-tier storage, an accelerator cache layer, or for virtualization workloads, this drive simplifies capacity planning and helps deliver predictable, low-latency application performance at scale.