HPE P48803-B21 - HPE DL380 Gen11 x16/x16/x16 Primary Riser Kit

Brand: HPE | Category: Accessories & Components

SKU: HPE-P48803-B21 | Part #: P48803-B21 | MPN: P48803-B21

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The HPE P48803-B21 primary riser kit is the mechanical and electrical backbone that determines how many high-performance expansion cards your ProLiant DL380 Gen11 can actually support. In a 2U server where physical space is constrained and every slot matters, this riser card assembly makes the difference between running one GPU or NIC and running three—unlocking the parallel compute, network bandwidth, or storage acceleration that modern AI labs, financial trading platforms, and hyperscale operations depend on. The P48803-B21 provides three full-length, full-height PCIe Gen5 x16 slots, each capable of holding a double-width accelerator card without compromise to signal integrity or thermal performance.

HPE engineered the P48803-B21 specifically for the Gen11 architecture, which means the riser card integrates directly with the proprietary HPE Gen11 riser connector on the DL380 Gen11 motherboard. This is not a generic PCIe adapter—it is a precision-engineered assembly that ensures proper mechanical retention, electrical stability, and alignment within the tight form factor of a 2U chassis. Network architects and infrastructure engineers responsible for blade refresh cycles know that the riser kit is often the first constraint they hit when scaling GPU or SmartNIC density. With three independent x16 lanes per slot, the P48803-B21 eliminates the PCIe bottleneck that would otherwise force you into larger, more power-hungry server platforms. Each slot runs at full PCIe Gen5 speed, meaning GPUs clock full bandwidth for AI inference and training workloads, and network adapters achieve line-rate forwarding on 400GbE fabric.

Installation and lifecycle management of the HPE P48803-B21 integrates seamlessly with HPE iLO 6, the embedded systems management engine found on every ProLiant DL380 Gen11. The riser card is inventoried automatically by iLO 6, and health status is reported in real time—a critical requirement for data-centre operators who need to track component health across hundreds of servers. If the riser experiences thermal stress or electrical fault, iLO 6 flags it immediately, preventing silent failures that could cascade into workload loss. For procurement teams and facility managers, this means the P48803-B21 is not a passive mechanical part; it is an actively monitored component that feeds into your infrastructure observability stack. HPE QuickSpecs compliance ensures the kit meets HPE's rigorous qualification standards for the DL380 Gen11 platform, so you know power delivery, thermal routing, and signal integrity have been validated at scale.

The primary riser position in the DL380 Gen11 is the most direct path to the CPU fabric, which is why this kit is the choice for latency-sensitive and bandwidth-intensive deployments. Data-centre architects building AI training clusters, real-time analytics platforms, and high-frequency trading systems prioritize the primary riser for the lowest-latency GPU or accelerator placement. Secondary and tertiary risers exist on the DL380 Gen11, but they traverse longer electrical paths and are typically reserved for management cards or less critical expansion. The P48803-B21 puts your three most important cards in the best position on the platform. Each slot supports double-width card profiles, which is essential because virtually all modern accelerators—NVIDIA H100, A100, AMD MI300X, and Intel Gaudi2—are double-width designs. HPE designed the Gen11 riser geometry to avoid the card-stacking and airflow issues that plagued earlier generations, so thermal performance remains predictable even with three high-power cards drawing 300+ watts total.

Omnixon Global stocks genuine HPE P48803-B21 primary riser kits for immediate deployment across the GCC region and beyond. Whether you are refreshing a data-centre footprint in Dubai, scaling an AI research facility in Saudi Arabia, or provisioning enterprise infrastructure across Asia, we hold the inventory and technical expertise to guide your configuration. Our team works directly with procurement, systems engineering, and operations groups to ensure the P48803-B21 and its supporting components are correctly spec'd and shipped ready for installation. For an RFQ or technical consultation on ProLiant DL380 Gen11 riser configurations, contact our technical sales team today.

PCIe Architecture and Slot Configuration

• Three full-length, full-height (FLFH) PCIe Gen5 x16 slots, each capable of supporting double-width accelerator cards
• Primary riser position ensures lowest-latency access to CPU fabric and optimal bandwidth allocation for demanding workloads
• Proprietary HPE Gen11 riser connector provides mechanical retention and electrical stability within 2U form factor
• iLO 6 integration enables real-time health monitoring, inventory tracking, and automated fault reporting
• HPE QuickSpecs compliance guarantees platform qualification for power delivery, thermal performance, and signal integrity
• Compatible exclusively with HPE ProLiant DL380 Gen11 servers; part number P48803-B21 is the only primary riser option for this platform
• Supports simultaneous operation of three high-power cards (H100, A100, MI300X, Gaudi2 profiles) without thermal or electrical compromise