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Cooler Master Hyper 48 KHC-L91 Heatsink Review
Cooler Master Hyper 48 KHC-L91 Heatsink Review
Abstract: The Cooler Master KHC-L91 Hyper48 comes with a collection of brackets and mounting plates which enable its use on socket 478/775 Intel Pentium 4 and socket 754/939/940 AMD Athlon64 processors.

 Manufacturer  Category  Published  Author 
CoolerMaster   Cooling / Heatsinks   Feb 26, 2006   Max Page  

Home > Reviews > Page: 360° View - Coolermaster Hyper48 KHC-L91 Heatsink

360° View - Coolermaster Hyper48 Heatsink
Information on Frostytech's test methodology is available here.
The Heatsink Fan:

A stylish black wire grill shields the 9-bladed impeller on the 92x92x25mm Delta NFB0912L fan. The upper half of the fan frame is cut away and the edges of the fan blades are extended a little into that space. This alteration diminishes the most common source of fan noise - air entering the fan body. Power comes via a standard 3-pin motherboard fan header which supports RPM monitoring. According to Coolermaster, fan speed is 1400RPM. According to Delta that figure is supposed to be 2100RPM.

Heatsink Top:
An aluminum fan shroud wraps around the upper portion of the Hyper48's copper fins and supports the 92mm fan with a 5mm plenum below. The four heatpipes are spaced a good 26mm and 10mm apart so as not to restrict airflow entering the body of the cooler by much. The copper fins are 0.3mm thick and positioned every 2.4mm. Note how the heat pipes converge at the base of the Hyper48 so they're directly over the CPU core.

Heatsink Side A:
The four 6mm diameter copper heat pipes converge at the base of the heatsink directly over the CPU core, which is where temperatures are highest. The copper base plate is 5mm thick on average, but extends to 10mm thick where contact is made with the CPU's integrated heat spreader.

Heatsink Side B:
The Hyper48 is 68mm wide at the base and 93mm at the top. The copper fins use interlocking tabs which keep fin-to-fin spacing exact.

Heatsink Side C:
The two shoulders on either side of the Hyper48 heatsink are for the K8 / P4 heatsink mounting clips to rest on. When clipped into place over a CPU, the clamping forces are applied to these two pads. If you look at the side of the Delta fan you can easily see how half the frame is split open. The heatsink stands 96mm in height. The fan is 25mm thick.
Heatsink Base:
The copper base measures 68x55mm and is responsible for distributing heat from the CPU to the heatpipes and copper fins. The four screw holes surrounding the round 40mm portion are for the LGA775 mounting clip to attach to. An engineer's straight edge shows us that base flatness is excellent, with surface roughness being about 8 microinches or thereabouts.

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Table of Contents:

 1:  Cooler Master Hyper 48 KHC-L91 Heatsink Review
 2: — 360° View - Coolermaster Hyper48 KHC-L91 Heatsink
 3:  Surface Roughness and Acoustic Comparisons
 4:  Final Heatsink Temperature Comparisons

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