Lenovo 4H47A87832 SR645 V3 1U Liquid to AIR Heatsink

Lenovo 4H47A87832 SR645 V3 1U Liquid to Air Heatsink

Overview

The Lenovo 4H47A87832 is a 1U liquid-to-air heatsink engineered specifically for the ThinkSystem SR645 V3 platform — a server line built around AMD EPYC processors that generates the kind of sustained thermal load that standard air-only cooling solutions can struggle to manage. At 10 lb, this is a substantial assembly: liquid-to-air designs transfer heat from the processor via a liquid cold plate to a fin array exhausted by chassis airflow, delivering more efficient heat removal than a pure air heatsink without requiring full liquid cooling infrastructure in the rack.

The 1U form factor constrains every component in the chassis, and thermal headroom is frequently the deciding factor between stable sustained performance and CPU throttling under heavy workloads. A replacement or supplemental heatsink of this class is the correct call when you're running high core-count EPYC configurations in thermally dense environments — think high-density server deployments, HPC edge nodes, or AI inference racks where per-socket TDP budgets push against what conventional heatsinks can dissipate in a 1U envelope.

Key Features

• Liquid-to-Air Thermal Transfer: The liquid cold plate contacts the processor die directly, conducting heat into a fluid loop before exhausting via the fin array — this intermediate step moves more heat per unit of airflow than air-only contact, which matters when you're constrained to 1U chassis clearance and can't stack a taller heatsink.
• SR645 V3 Platform Fit: Designed to the mechanical and thermal spec of the Lenovo ThinkSystem SR645 V3, so mounting points, cold plate contact geometry, and airflow routing match the chassis without modification. Using an off-spec heatsink on EPYC platforms risks improper IHS contact and uneven thermal paste distribution — the platform-matched design eliminates that variable.
• 1U Rack Form Factor: Stays within standard 1.75-inch rack unit height, compatible with 1U slot allocations in any standard 19-inch rack. No special rack spacing required — relevant when you're planning density across a full cabinet and can't afford to skip rack units.
• 10 lb Assembly Weight: At 10 lb, the 4H47A87832 is a substantial heatsink — verify server rail and chassis support ratings before installing, particularly in mobile rack deployments or any configuration where chassis weight budgets are a factor.
• Mexico Country of Origin: Manufactured in Mexico (UNSPSC 43201538 — computer hardware accessories). For procurement teams tracking country-of-origin requirements, MX origin is generally compatible with domestic preference thresholds under most US federal and commercial procurement frameworks — verify against your specific contract terms.
• Commercial-Grade Server Accessory: Sourced as a genuine factory-new server heatsink component. No grey-market, no parallel imports — relevant when you need consistent thermal interface quality across a fleet of SR645 V3 nodes.

Integration and Compatibility

The 4H47A87832 is matched to the ThinkSystem SR645 V3 server platform. Before ordering, confirm your SR645 V3 configuration number and existing heatsink spec against Lenovo's SR645 V3 component compatibility matrix — some high-TDP EPYC processor options ship with a different heatsink SKU from the factory, and installing a non-matched unit can affect thermal warranty coverage. If you're planning a rack cooling upgrade across multiple SR645 V3 nodes, cross-reference processor TDP against heatsink TDP rating in the ThinkSystem SR645 V3 Product Guide before deploying at scale.

Frequently Asked Questions

Q: What server is the Lenovo 4H47A87832 heatsink compatible with?

A: The 4H47A87832 is designed for the Lenovo ThinkSystem SR645 V3, a 1U AMD EPYC-based server platform. It is not a universal heatsink — confirm compatibility with your specific SR645 V3 configuration before ordering.

Q: What does "liquid to air" mean for this heatsink — does it require external liquid cooling infrastructure?

A: No external liquid cooling loop or chiller is required. Liquid-to-air in this context means the heatsink uses a liquid-filled cold plate to pull heat from the CPU die more efficiently before transferring it to a fin array cooled by standard chassis airflow. It operates entirely within the server chassis.

Q: What is the weight of the 4H47A87832?

A: The 4H47A87832 weighs 10 lb. Account for this when calculating total server chassis weight, particularly in high-density rack deployments or mobile rack applications.

Q: Where is the Lenovo 4H47A87832 manufactured?

A: Country of origin is Mexico (MX). For procurement compliance, verify this against your specific contract country-of-origin requirements.

Q: Can this heatsink be used in a 2U server chassis?

A: The 4H47A87832 is a 1U form factor heatsink designed to fit within 1.75-inch rack unit height. While the physical heatsink would fit in a taller 2U chassis, it is matched to the SR645 V3 platform mechanically — use it only in the platform it was designed for to ensure correct cold plate contact and mounting.

Ted Perry

The 4H47A87832 is the kind of component that only matters when it matters — but when it does, it matters a lot. At 10 lb, this liquid-to-air assembly is purpose-built for the SR645 V3 chassis, and the liquid cold plate design is there precisely because the AMD EPYC socket in a 1U envelope can push thermal demands that air-only heatsinks start losing against under sustained all-core workloads.

Technical Highlights:

• Liquid Cold Plate Design: Heat is conducted from the processor die into a liquid-filled cold plate before transferring to the fin array — this intermediate step improves thermal conductivity at the processor interface, which is where the bottleneck is in dense 1U configurations running high-TDP EPYC SKUs.
• 1U Platform Match: The mechanical fit is specific to the SR645 V3 — correct cold plate geometry, correct mounting torque points, correct airflow orientation for the chassis fan zone. A generic heatsink in this slot is a thermal risk; the platform-matched part removes that variable.
• 10 lb Assembly: Heavier than a standard air heatsink — the liquid cold plate assembly adds mass. Factor this into chassis weight calculations, especially if the server is mounted in a mobile rack or a cabinet with strict per-RU weight limits.

Deployment Considerations:

• Before installing, cross-reference your SR645 V3 processor TDP against the heatsink's rated TDP ceiling in the Lenovo ThinkSystem SR645 V3 Product Guide — not all EPYC configurations use the same heatsink SKU, and installing the wrong unit can void thermal coverage on the processor.
• Watch out for thermal paste application: liquid-to-air cold plates typically ship with pre-applied TIM (thermal interface material), but if this is a replacement unit being installed in a used chassis, clean the IHS thoroughly before seating to avoid air gaps that negate the liquid cold plate advantage.

This is the right part for an SR645 V3 running high core-count EPYC workloads — AI inference, video analytics at the edge, or HPC nodes — where sustained thermal load is a design constraint, not an edge case.