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SilenX EFZ-120HA4 Heatsink Review
SilenX EFZ-120HA4 Heatsink Review
Abstract: The SilenX EFZ-120HA4 heatsink is a full tower cooler, standing 151mm tall and weighing 836 grams. It ships with a single non-PWM 120mm SilenX 'Effizio Series Quiet Fan' mounted to the aluminum fin tower with four rubber vibration absorbing posts.

 Company link  Category  Published  Author 
SilenX   Cooling / Heatsinks   Sep 03, 2010   Max Page  
Home > Reviews > Page Title: 360° View - SilenX EFZ-120HA4 Heatsink Review

360° View - SilenX EFZ-120HA4 Heatsink

Information on Frostytech's test methodology is available here.

The 120mm fan spins at 800-2000RPM and draws power from a standard 3-pin motherboard fan header. The fan is barely held on by four rubber vibration absorbing posts which are spaced longer apart than the length of slots in the aluminum fins. Five 8mm diameter copper heatpipes rise up through bare aluminum fins which have a dimpled surface texture. Each aluminum fin measures 0.3mm thick and is spaced ~1.75mm apart.

The SilenX EFZ-120HA4 heatsink heatsink stands 151mm tall, the bottom-most fin being 40mm above the CPU socket for clearance. The five heatpipes are positioned side to side where they make direct contact with the processor, and expand outward to form an X shaped pattern through the aluminum fins. The base incorporates a 10mm thick aluminum section to provide support for clamping, with 11mm extruded aluminum fins above for added cooling.

Looking at the SilenX EFZ-120HA4 heatsink from the top we can see the dimpled aluminum texture. The edges of the stamped aluminum fins are sharp, so take care when handling this cooler. The pattern of heatpipes passing through the fins helps to ensure equitable heat conduction to the areas receiving the most airflow from the 120mm fan. The base of the heatsink measures 40x53mm in size. The five 8mm diameter heatpipes are spaced about 1.5mm apart.

Base Finish and Flatness

Flipping a heatsink over to inspect the business end is often a simple indicator of overall cooler quality. More practically speaking, a heatsink is in many ways only as effective as the contact it makes with the processor - the flatter and smoother the better. Base finish is one of the criteria that Frostytech measure in the course of evaluating heatsinks, and it involves two distinct aspects. Surface Finish is the first; this is calculated with the aid of Surface Roughness Comparator that has a cross section of common machine surface finishes and their numerical surface roughness equivalents in microinches. The second is Surface Flatness. This is tested with an engineers straight edge or proven flat surface, in two axis.

The base of the SilenX EFZ-120HA4 heatsink has a machined surface roughness of approximately 16 microinches, which is considered very good. The base is machined perfectly flat in both axis, with a slight grooved finish from the tooling. The copper and aluminum parts are flush.

Sound level measurements are coming right up next.

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Table of Contents:

 1:  SilenX EFZ-120HA4 Heatsink Review
 2: — 360° View - SilenX EFZ-120HA4 Heatsink Review
 3:  Sound Level Measurements: Which Heatsink is Quietest?
 4:  AMD Heatsink Temperature Comparisons
 5:  Intel Heatsink Temperature Comparisons

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