345-BJJZ Dell 7.68TB PCI-E Gen4 NVMe Solid State Drive.

Dell 345-BJJZ — 7.68TB PCIe Gen4 x4 NVMe U.2 Enterprise SSD

High-capacity NVMe storage engineered for read-intensive enterprise workloads

The Dell 345-BJJZ is a high-density internal solid-state drive built to deliver fast, reliable read-heavy performance in data center servers and storage arrays. With 7.68TB of usable capacity, PCIe 4.0 x4 NVMe connectivity and a U.2 2.5" 15mm form factor, this drive balances large-scale storage needs with the low latency and throughput modern applications demand. It’s designed for mixed virtualized environments, database query acceleration, caching layers and other read-centric workloads where predictable, high-speed access to data is essential.

Key technical specifications

Core product details

• Manufacturer: Dell
• Part Number / SKU: 345-BJJZ
• Product type: Internal Solid State Drive (SSD)
• Capacity: 7.68TB
• Interface: PCIe Gen 4.0 x4 (NVMe)
• Form factor: U.2 2.5" (15 mm)
• Workload profile: Read-intensive (TLC, 1 DWPD)

Expansion and connectivity

The 345-BJJZ exposes NVMe storage over PCIe 4.0 x4 lanes, supporting modern server backplanes and NVMe-enabled hot-swap bays. It is intended for single internal 2.5" drive slots and can be integrated into NVMe-capable chassis that accept U.2 devices.

Performance and endurance characteristics

Optimized for read-heavy applications

Designed around read-intensive NAND and firmware tuning, the drive prioritizes high sustained sequential and random read throughput while maintaining consistent I/O response under load. Endurance is tuned to 1 drive write per day (1 DWPD), making this SSD ideal for cache tiers, content delivery, analytics, and database read replicas where writes are limited but read rates are high.

Reliability features

• Enterprise-grade NAND with wear-leveling and bad-block management
• Power-loss protection mechanisms to reduce risk of data corruption
• Advanced S.M.A.R.T. telemetry for health monitoring and predictive maintenance
• Robust error-correcting code (ECC) and firmware integrity checks

Form factor, compatibility & server integration

Physical & electrical compatibility

The U.2 2.5" 15mm form-factor ensures compatibility with a wide range of Dell PowerEdge systems and other servers that support U.2 NVMe drives. Its PCIe Gen4 x4 interface unlocks higher bandwidth compared with previous-generation drives when paired with Gen4-capable motherboards or HBA/NVMe backplanes.

Verified Dell PowerEdge compatibility

The 345-BJJZ is compatible with many PowerEdge platforms commonly used in enterprise deployments. Supported systems include a broad set of rack and dense-compute servers, ensuring straightforward integration into existing Dell infrastructure:

• PowerEdge C6420, C6525, C6620
• PowerEdge R440, R640, R740xd, R670, R770
• PowerEdge R6415, R6515, R660xs, R6615
• PowerEdge R6525, R6625, R7425, R7525
• PowerEdge R760, R760xa, R7615, R7625
• PowerEdge R840, R940, R940xa, R960
• PowerEdge T560, Xe9640, Xe9680, Xr7620

Dell 345-BJJZ 7.68TB PCIe Gen4 x4 NVMe U.2 SSF 2.5" — Product Family Overview

The Dell 345-BJJZ family represents a class of high-capacity, enterprise-grade NVMe solid-state drives engineered for modern data centers and mission-critical server workloads. Designed to slot into U.2 2.5" bays and to take full advantage of PCIe Gen4 x4 NVMe bandwidth, the 7.68TB read-intensive TLC (1 DWPD) variant offers a balance of high density, low latency, predictable performance, and enterprise reliability tailored for Dell PowerEdge rack servers across generations 14G, 15G, 16G and 17G.

Target applications and ideal workloads

This SSD is optimized for read-dominated workloads where capacity and throughput matter more than extremely high sustained write endurance. Typical use cases include:

• Database read replicas, analytics and reporting (OLAP)
• Content delivery and caching layers
• Virtual desktop infrastructure (VDI) read-intensive pools
• Big data indexing and search (e.g., Elasticsearch, Solr)
• Media streaming and high-concurrency file serving
• Boot volumes and large read-only datasets

Key features and technical highlights

PCIe Gen4 x4 NVMe interface

PCI Express Gen4 doubles per-lane throughput compared with Gen3, and the x4 NVMe connection allows the 345-BJJZ drive to achieve significantly higher sequential and random performance figures than legacy SATA or SAS SSDs. The NVMe protocol reduces I/O overhead, improves IOPS per watt, and lowers latency for small block and mixed workloads.

Enterprise-grade 3D TLC NAND (Read-intensive) with 1 DWPD

The drive uses triple-level cell (TLC) 3D NAND configured for read-intensive endurance. With an endurance rating of approximately 1 Drive-Write-Per-Day (DWPD) over the warranty period, this SSD is ideal where read performance is paramount and write amplification is moderate. TLC delivers excellent density and cost-effectiveness compared to higher-endurance SLC/MLC options while still meeting enterprise reliability standards.

Large capacity in a compact 2.5" U.2 form factor

At 7.68TB usable capacity, this U.2 2.5" SSF (small form factor) drive packs massive storage into one server bay — enabling dense, high-capacity storage configurations without the footprint of 3.5" drives. This helps reduce rack space and improves power efficiency per terabyte.

Power management and thermal controls

Built-in power management features and thermal throttling safeguards maintain data integrity and stable performance under heavy sustained IO. The drive supports enterprise SMART attributes and telemetry, enabling integration with server management tools for proactive monitoring.

Performance characteristics

Sequential throughput

PCIe Gen4 x4 and NVMe allow the 7.68TB Dell 345-BJJZ drive to deliver high sequential read bandwidth suitable for moving large datasets and streaming workloads. Sequential read speeds are optimized for large-file transfer and content delivery scenarios.

Random IOPS and latency

Random read IOPS are a major strength of NVMe-based enterprise SSDs. The drive provides high IOPS at low latency for small-block random reads — a crucial attribute for database query response times, virtualization, and interactive application performance.

Consistency and QoS

Enterprise firmware ensures consistent I/O response under mixed loads. Quality-of-Service (QoS) stability reduces latency spikes caused by background maintenance tasks like garbage collection or wear leveling, making this drive appropriate for latency-sensitive production deployments.

Compatibility and server integration

Certified for Dell PowerEdge 14G–17G

The drive is explicitly targeted for compatibility with a range of Dell PowerEdge server generations — 14th through 17th generation systems. Use of Dell-certified firmware and validation ensures compatibility with server backplanes, RAID controllers configured for NVMe passthrough, and Dell iDRAC/SR management stacks.

Hot-swap and U.2 connectivity

The U.2 connector and small form factor mean drives can be deployed in hot-swap bays where supported by server hardware and firmware. This enables rapid replacement and serviceability in enterprise environments without taking hosts offline.

Firmware and fleet management

Dell-validated firmware releases for the 345-BJJZ SSD include enhancements for compatibility, telemetry, and performance tuning. Fleet administrators can use Dell OpenManage and iDRAC to review SMART status, update firmware, and perform drive diagnostics across many servers.

Deployment patterns and architecture considerations

Single-drive vs. aggregated arrays

Depending on the workload and redundancy needs, the 7.68TB NVMe drives can be used as standalone high-performance boot/data drives or aggregated into local NVMe pools. For high-availability and redundancy, combine NVMe drives with software RAID or NVMe-oF (NVMe over Fabrics) where supported to balance performance with resiliency.

Tiered storage strategies

Use these drives as the “hot” read tier in a tiered storage architecture. Cold or archival data can be placed on high-capacity HDDs or lower-cost SATA SSDs, while the Dell 345-BJJZ drives serve frequently-accessed datasets — improving overall application responsiveness and reducing total cost of ownership (TCO).

Virtualization and VDI design

When architecting VDI or containerized workloads, allocate read-centric golden images and persistent caches to these NVMe drives. Their high random read throughput dramatically shortens boot storms and improves user experience during peak concurrency.