70% Abstract: The Intel 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.
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| 360° View - Intel stock Core 2 Duo Heatsink |
Information on Frostytech's test methodology is available here.
| ||The Heatsink Fan: |
The stock Intel Core 2 Duo heatsink is built with an 84mm diameter fan that spins at speeds an est. 1500RPM. The speed of the seven-bladed Pulse Width Modulation (PWM) Nidec fan is controlled via the BIOS. Power is supplied by the 4-pin PWM fan cable which connects to a standard 3-pin or 4-pin motherboard fan header. As with most Intel reference LGA775 heatsinks, the fan is suspended upside down 2mm above the cooling fins, without a complete fan guard. The plastic motor supports offer some marginal protection from errant wires being drawn into the impeller, but it's best to ensure cables are kept tidy inside the PC. This fan draws 0.2A, where the older stock Pentium D fan drew 0.42A, so there is quite a difference in fan speed between the two models.
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With the fan support structure removed, the unique design of Intel's stock Core 2 Duo heatsink is clearly visible. The central copper core is hollow for the most part so the metal doesn't retain heat. A lot of third part heatsink vendors mess this up when they copy the design. The copper is about 7mm thick at the base, then the remaining 23mm deep cavity opens up so there is just 2mm of copper along the walls. The aluminum 'donut' measures 90mm in diameter, with 2.5mm of aluminum wrapping around the copper and then 25mm long aluminum cooling fins extending out. Each aluminum cooling fin is 0.92mm thick and spaced 1.5mm at the base, 1.8mm apart at the tip. The bifurcated tips are each 0.5mm thick to allow air to easily pass through.
| || Heatsink Side A:|
The body of the stock Intel Core 2 Duo heatsink stands exactly 30mm tall, with an overall height of 61mm. The older Pentium D reference heatsink stood 72mm tall. The four push-to-lock plastic clips lock directly into the 4mm motherboard mounting holes which surround the LGA775 processor socket. To release the heatsink from the board, the upper portion of the clip is rotated 90 degrees and pulled upwards. The heatsink then pulls free of the motherboard.
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Heatsink Side B:
The fan support frame locks onto the aluminum portion of the heatsink with a couple slashes cut into the side of the fins. The fan frame is held in tension, so vibration and rattling shouldn't be an issue. Air is exhausted outwards from the cooling fins, where it can then be used to cool adjacent board-mounted components.
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The copper base of the stock Intel Core 2 Duo heatsink is 28.75mm in diameter where it makes contact with the processors' integrated heatspreader (IHS). The heatsink ships with a thin grey pad of ShinEtsu thermal interface material pre-applied. The copper is machined perfectly flat, and is smooth. Surface roughness is on the order of ~8 microinches, which is considered excellent.
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