Fan on the video card. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Computers
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The absence of fans in video adapters for a long time was perceived by me as a virtue: if they don’t install it, then the thermal regime is normal without it. The misconception dissipated when I decided to check the temperature of the heatsink of the video adapters - it turned out to be undesirably high and even exceeded the temperature of the heatsink of the microprocessor. One of the reasons for overheating is the placement of the heatsink under the board, which prevents natural air circulation, and in such conditions even the best needle heatsinks are not able to work effectively and turn into de facto heat sinks.
The way out was quite obvious - install a fan on the radiator, i.e. turn it into a cooler. Since the "thermal power" of the video processor is small (much less than that of the microprocessor), even the smallest fan will provide cooling with a large margin. Therefore, it is advisable to reduce the frequency of its rotation to the minimum possible, which will reduce the current consumption, acoustic noise and vibration. The simplest way is to include a maximum resistance resistor in the power circuit, which still ensures a reliable start (for fans with a supply voltage of 12 V - 68 ... 300 Ohm). Using the circuit shown in fig. 1, it is possible to provide an additional reduction in fan power by increasing the resistance of the quenching resistor R1, since the boost capacitor C1 will provide the initial spin-up. Resistor R1 - MLT-0,5, capacitor C1 - K50-16, K50-35 or similar imported.
You can use any miniature fan, for example, KF-0410C1H (supply voltage - 12 V), D40SM-5A (5 V) or a fan removed from the microprocessor cooler. Mounting to the radiator can be anything, for example, the author simply glued it with hot glue at four points. You just need to pay attention to the fact that the mount does not interfere with the movement of air.
After the revision, the temperature of the video processor heatsink dropped to ambient - the heating became almost imperceptible.
Author: D.Turchinsky, Moscow
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