thing about buying a retail Intel Core 2 Duo processor from the computer store is that
it comes with a heatsink guaranteed to work. It may not be the coolest running
heatsink out there, but at least Intel have ensured it
runs quietly, maintains the appropriate thermal range for the CPU, and
installs without much fuss or any danger to the CPU or motherboard.
have been reading Frostytech for a while, you'll know that the reference Intel heatsink for the Core 2 Duo CPU family is based on
Intel's Radial Curved Bifurcated Fin Heatsink (RCBFH) design. In all
likelyhood this heatsink that Frostytech is testing today was manufactured by AVC - a large thermal
solutions manufacturer which has made several Intel and AMD reference
RCBFH design is engineered to be cheap to produce, easy to install, and
thermally efficient. This is the stock Core 2 Duo heatsink, and it is generally
speaking a well designed mass-produced cooler. The heatsink uses a suspended
4-pin PWM 84mm diameter Nidec F09A-12B1S2 fan, it conforms to ATX motherboard
keep-out and high recommendations, and LGA775 weight restrictions.
As we'll show you, this stock Core 2 Duo heatsink relies on a unique central copper heatspreader pressed into a high aspect ratio extruded radially curved
bifurcated aluminum fin. Per Intel's own requirements, the stock Core 2 Duo heatsink installs and can be removed from any LGA775 motherboard using tool free snap clips.
|Intel stock Core 2 Duo Heatsink
|Model No.: Stock Core 2 Duo|
|Materials: Extruded aluminum, copper insert.|
|Fan Mfg: Nidec F09A-12B1S2|
|Fan Spec: 1500PM (est.), 12V, 0.20A|
|Fan Dim: 25x84x84mm|
|Heatsink & Fan Dim: 61x90x90mm |
|Weight: est. 380 grams|
|Includes: pre-applied thermal compound.|
Compatible with Sockets: LGA775
|Est. Pricing: $25USD
is going to evaluate the stock heatsink that accompanies the majority
of Intel Core 2 Duo processors. It closely resembles many other Intel and third
party RCBFH-based heatsinks.
2 Duo heatsink is composed of two sections - the first an outer ring of extruded aluminum with 24mm long curved cooling fins, the second an internal 32mm diameter
cylindrical copper heat spreader. The copper heat spreader makes direct contact with
the processor integrated heat spreader, conducting the heat it absorbs out to a larger surface area
in direct contact with the aluminum. The copper makes direct
contact with the aluminum fin via a toleranced interference fit, so no thermal compound is
Aluminum has a thermal conductivity of 247 W/mK, whereas copper
(which is heavier and more
costly) has a thermal conductivity of 398
W/mK. The technique of building heatsinks with copper centers and outer aluminum cooling
fins has long been used to conduct heat energy quickly away from the CPU.
The copper component quickly conducts that heat to a larger surface area which
is in direct contact with the specially shaped aluminum cooling fins. From there, increased surface area and airflow disperse the heat into the surrounding environment.
Please note that within this review the stock Intel Core 2 Duo heatsink will be tested with a 3-pin power source. As such, the fan RPM it defaults to may not represent the upper limit it's capable of with a 4-pin PWM fan power source.
The Intel Core 2 Duo heatsink will be tested on FrostyTech's Intel LGA775 version of the Mk.II
synthetic thermal temperature test platform, and
compared against several reference LGA775 heatsinks. The whole test methodology is outlined in detail
here if you'd like to know what
equipment is used, and the parameters under which the tests are conducted. Now
let's move forward and take a closer look at this heatsink, its acoustic
characteristics, and of course its thermal performance!