Abstract: The CNPS9500 AM2 heatsink is identical in materials and size to previous CNPS9500-series heatsinks, but since this cooler is being launched in conjunction with the nVidia nForce 500-series chipset and socket AM2 Athlon64, it has received a few special touches.
|360° View - Zalman CNPS9500 AM2 Heatsink
Information on Frostytech's test
methodology is available
||The Heatsink Fan: |
The 92x92x25mm fan spins at 1350-2600RPM with the Fanmate
2 attached, producing 18-27 dBA according to the companies data. The lack of
any fan guard presents a challenge for systems with many loose wires
dangling around inside the case, and the CNPS9500 AM2's height
of 126mm precludes it from being used in compact or SFF-PC cases.
The fan draws power from a standard 3-pin motherboard fan header that supports RPM
monitoring. The seven bladed impeller is internally illuminated by a pair for nVidia-green LEDs.
The Looking down at the top of the
Zalman CNPS9500 AM2 heatsink we can see the basic shape of its 88 chrome-plated
copper fins. The 9mm wide indentation at the center provides space for
a screwdriver further down when engaging the heatsink clip onto the CPU retention
bracket. The clip fits in perpendicular to
the direction of the heatpipes, and parallel, depending on the AM2 socket orientation. Each
fin measures just 0.2mm thick. Fins are spaced 3mm at the tip, and 1mm along
the inside curvature. The copper fins are all soldered directly to each of the three
copper heatpipes, and the entire heatsink has been chrome plated.
Heatsink Side A:
The 92mm fan is suspended in
the center of the radial fins and figure-eight heatpipe assembly on a pair
of stainless steel posts. When powered up, vibration was not noticeable. The
space directly behind the fan motor is
empty, which makes sense as this is generally a dead-spot for airflow. The
Zalman CNPS9500 AM2 heatsink installs onto socket 754/939/940 and AM2 CPUs with a
special steel clip that fits over the nub of the cast aluminum base cap. The clamping force
is focused directly at the center of the heatsink's base, for even loading on the processor
integrated heat spreader.
Heatsink Side B:
Every side of the 530 gram Zalman
CNPS9500 AM2 heatsink is made for cooling as we can see from this image.
fins extend out to a diameter of
112mm. Each of the three copper heatpipes are 6mm in diameter. The
base consists of a shaped copper section to
which the heatpipes are soldered, and a base cap made from cast aluminum.
The copper base is about 2.5mm thick on average, 4mm at the
most. We'll assume that the entire heatsink was fabricated and soldered
together before any of the chrome plating is applied to its surface.
The The 38mm x 40mm copper base is soldered to the
heatpipes so thermal conductivity is direct as possible through to the
rest of the heatsink. The copper base has been machined flat,
and very smooth. Surface roughness is on the order of ~12 microinches,
which is considered very good.
Zalman has revised its manufacturing techniques
for the CNPS9500-series since FrostyTech last tested CNPS9500 LED heatsink, as the company typically does to improve quality.
The copper base is a little bit thicker now, and the aluminum cap
hovers about 0.8mm above the heatpipes, instead of coming in direct contact
with them. The result of these optimizations is a base which is
quite flat in both axis.
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