Supermicro SNK-P0046A4 1U Passive Cpu Hs for 2U Activ - Compact Server

In this review of the Supermicro SNK-P0046A4 heatsink, the conclusion is practical and focused: this unit is for system builders and IT technicians who need a compact, low-noise cooling solution for 2U servers that use LGA1156 or LGA1155 processors. The biggest reason to consider it is the balance of compatibility and quiet operation in a dense rack environment - it supports Xeon 3400 and Core i3/i5/i7 series processors while maintaining modest noise and a push-in pin mounting approach that simplifies upgrades. This review examines performance, fit, and where it makes sense in a server bay.

Key Features

• Compatibility: Fits both Socket LGA1156 and LGA1155 systems so you can reuse the same cooler across multiple older server builds.
• Application fit: Designed for 2U UP servers and workstations, it provides an appropriate thermal profile for constrained chassis with vertical airflow.
• CPU support: Rated for Xeon Processor 3400 series and Core i3, i5, i7 series processors, giving clear guidance on supported CPU families.
• Low noise: With a reported noise level of 33.5 dBA, it stays relatively quiet for rack-mounted environments where acoustic load matters.
• Fan performance: The fan speed of 2800 RPM delivers steady airflow to cool higher TDP parts in a 2U layout without excessive RPM ramping.
• Mounting: Push-in pin mounting lets technicians replace or install the cooler quickly without specialized tools.

Who It's For

The SNK-P0046A4 is aimed at IT professionals and systems integrators maintaining legacy 2U systems or upgrading existing LGA1155/1156 servers. It is particularly useful for applications where compact height and predictable acoustic behavior are priorities, such as lab racks, branch office servers, or compact workstations running supported Xeon or Core processors.

Those who should look elsewhere include builders of modern platforms with newer socket types and anyone requiring active 1U ultra-low profile cooling or extreme overclocking headroom; the heatsink is optimized for its target sockets and chassis rather than current-generation CPUs.

Pros & Cons

Pros

• Good backwards compatibility with LGA1156 and LGA1155 saves time when migrating or refurbishing servers.
• Quiet operation at 33.5 dBA helps keep rack noise manageable in office or lab settings.
• Push-in pin mounting reduces install time during maintenance cycles.
• Balanced fan speed of 2800 RPM provides steady airflow without aggressive noise spikes.

Cons

• Designed for older socket platforms, so it is not suitable for current-generation CPUs and modern motherboards.
• As a 2U+ active design, it may not fit into strict 1U height constraints or exotic chassis layouts.

Specifications

Product model	SNK-P0046A4
Application	2U UP Servers and Workstations
Socket type	Socket LGA1156 and LGA1155
CPU support	Xeon Processor 3400 and Core i3/i5/i7 Series
Fan speed	2800 RPM
Noise level	33.5 dBA
Mounting method	Push-in Pin

Our Verdict

The Supermicro SNK-P0046A4 is a sensible, workmanlike heatsink for technicians maintaining LGA1155/1156 2U systems; it offers reliable cooling, low noise, and easy installation at a reasonable value for legacy server platforms. Buy it if you need a drop-in, quiet cooling upgrade for Xeon 3400 or compatible Core series CPUs in 2U chassis, but skip it for modern socket needs.

Frequently Asked Questions

Will this fit modern motherboards?
It is designed for Socket LGA1156 and LGA1155 only and will not be compatible with newer socket types without appropriate mounting and chipset support.

Is the noise level suitable for office racks?
At 33.5 dBA the unit is relatively quiet for server cooling and is acceptable in many office or lab racks, though room acoustic preferences vary.

How difficult is installation?
The push-in pin mounting method keeps installation straightforward and tool-free for technicians familiar with server hardware.