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JMC 401100 Phoenix 70 Radial Fin Heatsink Review
JMC 401100 Phoenix 70 Radial Fin Heatsink Review
Abstract: The original Agilent heatsink was made for socket 370 Pentium III processors, but this version is intended for use with socket 478 Pentium 4's.

 Manufacturer  Category  Published  Author 
JMC   Cooling / Heatsinks   Mar 24, 2003   Max Page  

Home > Reviews > Page: Taking a look at the heatsink from all sides

JMC 401100 Heatsink From All Angles
The Fan:
The fan is 67mm in diameter and surrounded by a 21mm wall of aluminum fins. Each aluminum fin is 1.2mm thick and spaced about 1mm apart. Rotating at 5500RPM, the fan is glued in place and comes with a nice long power cable that supports RPM monitoring. As you might be able to see behind the impeller, the fins are cut all the way back to the motor base. This provides a clear path for exhaust air to leave the heatsink as opposed to simply a flat surface.
Side A:
From this side we can see the slight angle with which the fins have been cut from the solid aluminum. Each fin is cut all the way down to the base with a circular blade so the inside geometry is gently sloped outwards. The baseplate is stepped to enable the spring clips for a socket 478 configuration to grip firmly, and the heatsink is notched out for clearance. The base plate is 3mm thick, but is not in direct contact with the processor heatspreader. The overall height of the cooler is 52mm.
Side B:
To keep the heatsink within width specs, JMC have machined the sides on two faces flat. The base of the finned area is also notched out on all sides for clearance of various components. The three power cables coming from the fan are glued in place which is good to see. Left free, it is possible that the wires may come loose and cause the impeller to bind.
Heatsink Base:
The base of this particular heatsink isn't much to look at, but remember this is not a final example of a retail version. The heatsink comes with a pre-installed circle of thermal compound - though it looks as though a little too much was applied in this case. The finned section is inserted into the aluminum base and crimped into place. For added measure, this heatsink also had machine screws used, but since the processor only makes contact with the finned section it really doesn't matter how well the base plate is attached, just so long as it doesn't ever come loose. Base finish is machined flat and fairly good. The surface is smooth, but there is a small dimple at the center.

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Table of Contents:

 1:  JMC 401100 Phoenix 70 Radial Fin Heatsink Review
 2: — Taking a look at the heatsink from all sides
 3:  New Heatsink Test Parameters
 4:  Thermal And Acoustic Results
 5:  Final temperature results

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