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JMC 400074 Skyjet 70 Radial Fin Heatsink Review
JMC 400074 Skyjet 70 Radial Fin Heatsink Review
  82%   
Abstract: From our standpoint the visual similarities between this radial heatsink and the obs of long ago are pretty superficial.

 Company link  Category  Published  Author 
JMC Products   Cooling / Heatsinks   Mar 31, 2003   Max Page  
Home > Reviews > Page Title: The heatsink from all sides

JMC 400074 Heatsink From All Angles
The Fan:
The fan is 67mm in diameter and surrounded by a 22mm high wall of aluminum fins. Each aluminum fin is about 0.6mm thick and spaced about 3mm apart from the next. Rotating at 4500RPM, 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 go all the way back to the motor base. This helps to provides a better exhaust path for air to leave the heatsink.
Side A:
There isn't too much to talk about from the side here. The fins are 50mm in height with a small 10mm section cut from the bottom bit. This area of the fins is removed so the heatsink will physically fit into a standard P4 HSRM. The baseplate is 6mm thick and really only works as part of the retention system. A separate retention system will allow this heatsink to be attached to Xeon processors.
Side B:
It's easier to see why the bottom bits of the finned section where machined off. The diameter of the fins are a lot wider than the internal dimensions of the HSRM. The three power cables coming from the fan are glued in place to prevent them from potentially blocking the impeller (fan) from spinning. According to the spec sheet I have, the entire fan assembly is glued in place with Loctite Activator/Adhesive into a small recess.
Heatsink Base:
The base is flatter than I would have expected, and it looks as though the entire heatsink has had a dip in acid, or received a fine sandblast since the surface is evenly finished. The surface is matt, not shiny, but not rough either. The heatsink comes with a pre-installed circle of thermal compound. The finned section is inserted into the aluminum base with an interference fit.



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Table of Contents:

 1:  JMC 400074 Skyjet 70 Radial Fin Heatsink Review
 2: — The heatsink from all sides
 3:  Heatsink Test Parameters
 4:  Thermal And Acoustic Test Results
 5:  Final Synthetic Temperature results

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Time stamped: 3:48PM, 09.21.2019
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