Lenovo Thinksystem QLOGIC QL45212 FLEX 50 GB 2 -PORT Adaptador Ethernet (FRU 01KR581)
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Lenovo ThinkSystem QLogic QL45212 Flex 50 Gb 2‑Port Ethernet Adapter (FRU 01KR581)

Keywords

01KR581, QLogic QL45212, ThinkSystem Flex 50Gb adapter, 50 Gb/s Ethernet card, PCIe 3.0 x16 network adapter, RoCE Ethernet adapter, Lenovo QLogic 50Gb network card

Description

The 01KR581 is Lenovo’s official **ThinkSystem QLogic QL45212 Flex 50 Gb 2‑Port Ethernet Adapter**, a high-performance networking card designed for Flex, BladeCenter, and ThinkSystem servers. Based on Cavium’s 8th-gen FastLinQ ASIC, it delivers up to 50 Gb/s speeds via PCIe 3.0 x16, with features like RoCE, RoCEv2, iWARP, SR-IOV, and NIC partitioning for robust virtualization and scaling support .

Available new from resellers like ServerSupply with a 90-day warranty, or refurbished from Renewtech (35+ units, 1-year warranty) the adapter balances cutting-edge networking capability with broad support and cost flexibility.

Withdrawn from active marketing (per Lenovo Press, last updated Sep 30, 2024), it remains highly relevant for legacy and transitional infrastructure moving to 25/50Gb Ethernet while ensuring coexistence with existing 10Gb networks.

Key Features

  • Dual 50 Gb/s Ethernet ports over PCIe 3.0 x16
  • Support for RoCE, RoCE v2, iWARP, SR‑IOV, and NIC partitioning technologies 
  • Perfect for Lenovo Flex System, Blade, and ThinkSystem servers
  • Backward-compatible with 10/25 Gb networks using flexible speeds 
  • Designed for virtualization and high-throughput use cases
  • Available new (90-day warranty) or refurbished (1-year warranty) options 

Configuration

AttributeSpecification
Part Number (PN)01KR581 (aka 7XC7A05843)
AdapterQLogic QL45212 Flex 50Gb 2‑Port
Host InterfacePCIe 3.0 x16
Network Ports2 × 50 Gb/s (Base‑KR, no transceiver needed)
Form FactorMezzanine / Plug‑in card
TechnologiesRoCE, RoCE v2, iWARP, SR‑IOV, NPAR
ConditionNew or Refurbished
Warranty90 days (new), 1 year (refurbished)

Compatibility

Fully **Lenovo ServerProven** certified for Flex System chassis (SN550, SN850) and ThinkSystem servers supporting Flex mezzanine cards. Can also interoperate with 10/25/50 Gb Ethernet switches in converged data center deployments.

Works seamlessly with existing 10/25 Gb infrastructure through flexible speed negotiation .

Usage Scenarios

Ideal for high-density virtualization and HPC tools that require ultra-low latency and high throughput—leveraging **RoCE** capabilities for remote memory access acceleration.

Perfect for Flex System networks transitioning to 25/50Gb throughput, ensuring both backward compatibility and future readiness.

Well-suited for enterprise data centers needing multi-tenant network partitioning (NPAR/SR-IOV) with robust HW acceleration in converged storage or compute environments.

Frequently Asked Questions

  1. Q: Does the QL45212 support RoCE?
    A: Yes—it supports RoCE, RoCE v2, and iWARP, enabling low-latency RDMA functionality .
  2. Q: Is it backward-compatible with 10/25 GbE?
    A: Yes—Flex architecture auto-negotiates to lower speeds as supported .
  3. Q: What warranty options are available?
    A: New units include a 90-day warranty; refurbished Renewtech units include a 1-year warranty.
  4. Q: Which servers does it support?
    A: Certified for Lenovo Flex System (SN550/SN850) and ThinkSystem platforms via mezzanine slots .
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