|360° View - Apack Zerotherm BTF80
Information on Frostytech's test
methodology is available
||The Heatsink Fan: |
The 92x92x25mm fan spins at 750-2500RPM
by way of PWM
which is controlled by the motherboard. When attached to a standard
3-pin motherboard header the fan rotates at a fixed 25000RPM. The lack of any fan
guard presents a challenge for systems with many loose wires dangling
around inside the case, and the Apack ZeroTherm BTF80's height of 126mm precludes
it from being used in compact or SFF-PC cases. The fan draws power
from a PWM 4-pin motherboard fan header. The seven bladed
impeller is internally illuminated by a pair for red LEDs.
From the top, the Apack ZeroTherm BTF80 looks
like a butterfly, and is internally split down the center so in effect
there are two separate sections of cooling fins.
The anthropomorphic shape belies a rather clever balance between
air pressure from the fan and depth of aluminum for
that air to pass through... The tips of the four 6mm heatpipes
can be seen poking their heads out of the cooling fins.
The fan can be rapidly removed by pulling up on the red triangular
piece plastic at the center; either for a cleaning
Heatsink Side A:
From the rear, the aluminum fins of the Apack ZeroTherm BTF80 are spaced about 2.0mm apart. Each aluminum fin is ~0.2mm
thick. The heatpipes are soldered to a 4mm thick copper base plate, which
is in turn covered by a die-cast aluminum bracket that holds the mounting clip
in place and transfers clamping force to the heatsink. The Zerotherm BTF80 stands
126mm tall, and is 105mm wide.
The red plastic section separates the two portions of cooling fins and
also acts as the support for the fan.
Heatsink Side B:
The 6mm diameter heatpipes race up
from the copper base of the heatsink through 46 aluminum cooling
fins, before turning 180 degrees, and racing back down to the base
once more. In effect there are eight heatpipes constructed from just four
lengths of pipe. This method of fabrication may be the key to Apack's
success with the design of the Zerotherm BTF80 heatsink... and perhaps it
is this one facet of the entire design which lends such effective thermal
efficiency to a heatsink which is otherwise fairly standard.
The copper base measures 36mm x 48mm. It is soldered to each section of heatpipe, so in effect the full surface area
is covered by 6mm copper heatpipes placed side by side. The base
has a smooth machined finish and is pretty flat; there is some
slight doming in one axis that is visible when the surface is held
up to an engineers straight edge. The surface roughness is ~8 microinches, which is
considered very good. Note the screw holes in the die-case aluminum portion
where the mounting clip attaches to.