The HP 649282-B21 is an HP OEM ConnectX-3 VPI dual-port QSFP network adapter in HP FlexibleLOM (FLR) mezzanine form factor, marketed as the HP 544FLR-QSFP adapter. FLR = FlexibleLOM = HP's proprietary LOM mezzanine slot on ProLiant server motherboards. This is NOT a standard PCIe NIC with a bracket — it installs in the dedicated FlexibleLOM mezzanine slot on the server motherboard, not in a PCIe expansion slot. Supports InfiniBand FDR at 56Gb/s and 40GbE Ethernet (VPI). This is original HP-branded Mellanox hardware sold by T.E.S IT-SOLUTIONS (tes-itsolutions.com). Condition: refurbished.
Engineering
The HP 649282-B21 (544FLR-QSFP) uses the Mellanox ConnectX-3 VPI controller with two QSFP ports. The FlexibleLOM form factor means the card uses HP's proprietary OCP-style mezzanine edge connector on the motherboard rather than a PCIe slot. InfiniBand FDR operates at 56Gb/s per port (4×14Gb/s lanes). In 40GbE Ethernet mode, each port operates at 40Gb/s. PCIe 3.0 x8 interface (delivered via the FlexibleLOM connector). VPI architecture allows each port to be independently configured for InfiniBand or Ethernet. The HP 649281-B21 is the PCIe bracket version of the same ConnectX-3 VPI adapter; the 649282-B21 is the FlexibleLOM (LOM slot) version.
Deployment
Used in HP ProLiant Gen8 and Gen9 servers (DL360, DL380, DL560, ML350, BL series) that have the FlexibleLOM mezzanine slot. The FlexibleLOM position is on the server motherboard — it is the primary LOM (LAN-on-Motherboard) position and replaces the onboard NIC. Common in ProLiant deployments requiring FDR InfiniBand fabric connectivity alongside 40GbE Ethernet without consuming a PCIe expansion slot. Also deployed in blade server environments where PCIe expansion space is constrained.
Specifications
HP Part Number: 649282-B21
HP Model Name: 544FLR-QSFP
OEM: HP (Hewlett Packard)
Underlying Adapter: Mellanox ConnectX-3 VPI
Data Rate: 56Gb/s IB FDR per port / 40GbE per port
Port Count: 2
Connector: QSFP (both ports)
Host Interface: PCIe 3.0 x8 (via FlexibleLOM connector)
Form Factor: FlexibleLOM (FLR) mezzanine — no PCIe bracket
Protocol: VPI — InfiniBand FDR + 40GbE Ethernet
Condition: Refurbished
Compatibility
Compatible with HP ProLiant Gen8/Gen9 servers with a FlexibleLOM mezzanine slot: DL360p Gen8, DL380p Gen8, DL560 Gen8, DL360 Gen9, DL380 Gen9, ML350p Gen8, and BL-series with FlexFabric mezzanine. NOT compatible with standard PCIe expansion slots — FlexibleLOM requires the dedicated FlexibleLOM mezzanine position. NOT compatible with HP Gen10 servers (different FlexibleLOM connector revision in most configurations). NOT compatible with HP 331FLR or similar 1GbE FlexLOM adapters (different speed class). The PCIe bracket equivalent is HP 649281-B21. For a standard PCIe ConnectX-3 VPI card, see the NVIDIA MCX354A-FCBT.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a European reseller specializing in original and refurbished HP OEM Mellanox adapters and NVIDIA Mellanox networking hardware, operating since 2011. Each HP 649282-B21 is tested for FlexibleLOM interface link negotiation and port activity. Global shipping with 1–3 business day handling. Technical consultation available for HP FlexibleLOM compatibility verification.