The ExpressSlot Elite MB303E5P-B expands on ICY DOCK's removable E1.S storage platform by enabling two E1.S (9.5 mm) NVMe SSDs within a single PCIe expansion slot. Designed for high-performance servers, workstations, and edge platforms, it installs into a single-slot, full-height 3/4-length PCIe x8 or PCIe x16 slot and provides dual rear-accessible removable caddies at the PCIe bracket for faster SSD maintenance and replacement.

PCIe 5.0 x4 Performance per SSD for High-Speed NVMe Workloads
Built on a PCIe 5.0 x8 interface, the MB303E5P-B delivers up to 128 Gbps bandwidth per SSD via independent PCIe x4 links. This architecture enables full-speed NVMe performance for each drive, making it ideal for data-intensive workloads while maintaining a clean, expansion-slot-based deployment model.Dual Removable E1.S Caddies for Faster Service and Swap Cycles
Traditional enterprise EDSFF SSD installations often require opening the system chassis and navigating internal cabling. With the MB303E5P-B, both E1.S SSDs are accessible directly from the PCIe bracket through dual removable caddies, simplifying drive replacement and reducing maintenance time.

Each caddy supports E1.S 9.5 mm SSDs and features screwless SSD installation, allowing faster handling during system validation, deployment, and service operations - especially valuable in environments with frequent drive swap cycles.

Purpose-Built Active Cooling for Dual PCIe Gen 5 E1.S SSDs
PCIe Gen 5 SSDs generate significant heat under sustained workloads. The MB303E5P-B integrates a 50 mm frameless fan along with a sealed airflow chamber design to efficiently cool both SSDs.

By directing airflow through a controlled internal path, the enclosure improves heat dissipation across both drives—helping maintain consistent performance, reduce thermal throttling, and support long-duration, high-throughput operations.Where E1.S Makes Sense for Dual-Drive PCIe Deployment
E1.S (EDSFF) SSDs are increasingly adopted in modern platforms that prioritize density, serviceability, and PCIe Gen 5 performance. The MB303E5P-B is especially well suited for scenarios that require compact dual-drive deployment within a single PCIe slot, such as:

• Enterprise servers and storage appliances adopting EDSFF architectures
• AI / ML servers and data pipelines requiring high throughput NVMe storage
• Edge computing systems that need compact, serviceable NVMe media
• Telecom / networking platforms and rugged deployments where front access improves maintenance workflows
• System validation labs and OEM integration environments testing PCIe Gen 5 E1.S SSD behavior

Optional MB221TP-1B Screw-Mount Tray for High-Vibration Environments
For deployments requiring enhanced mechanical retention and long-term stability, the MB221E5P-B and MB303E5P-B also supports the optional MB221TP-1B screw-mount tray. Unlike the standard tool-less tray, the MB221TP-1B secures the SSD with screws and is compatible with both MB221E5P-B and MB303E5P-B enclosures.

This tray option is particularly suited for industrial PCs, transportation systems, edge computing, and other vibration-sensitive environments where additional SSD retention is preferred to help minimize connector movement during operation. The MB221TP-1B is available as a special-order accessory.


Key Features

• Supports 2 × E1.S NVMe SSDs (9.5 mm) with screwless SSD installation
• Fits single-slot, full-height 3/4-length PCIe card specification
• PCIe 5.0 x4 interface per SSD, up to 128 Gbps each
• Requires PCIe bifurcation:
  • PCIe x8 slot (x4/x4), or
  • PCIe x16 slot (x4/x4/x4/x4)
• Compatible with PCIe 5.0 x8 / x16 slots (with bifurcation support)
• Integrated 50 mm frameless fan for active cooling
• Sealed airflow chamber design for maximized cooling efficiency
• Dual removable SSD caddies for quick maintenance and replacements
• EMI grounding - protects drives from electrical interference
• Active Power Technology (APT) - LED and fan activate only when a drive is installed
• Industry-leading 5-year limited warranty
• Complimentary support from professionally trained US-based technical support agents