CPU cooler is now one of the necessary accessories in the computer, and the performance of the system plays a very critical role in the market a wide range of coolers really dazzling, how can I choose a suitable CPU cooler? Listen to me slowly. At present, the feasible CPU cooling methods are mainly divided into two categories, one is liquid cooling, one is air-cooled cooling. Liquid cooling, including water cooling, oil cooling, etc., mainly water cooling, and air-cooled cooling is a common heatsink inlaid with a fan on the top of the kind of cooling, the most varied, commonly used for everyone. The benefits of water-cooled radiator is outstanding cooling effect, there are few air-cooled radiator can be comparable to it, but it has a fatal flaw: the safety issue, although many water-cooled radiator claimed that never leakage, but no one can guarantee that certainly not leakage, as long as a leakage of water, your machine that's finished. In addition, water-cooled radiators are more troublesome because they require a large water tank and patient and meticulous installation. Air-cooled radiator cooling effect is not as good as water-cooled radiator, but because of its use of safe, easy to install the characteristics, so it has been the majority of computer gamers preferred radiator, but do we all know the principle of air-cooled radiator? In the face of all kinds of air-cooled radiator on the market, which effect is the best? The following for you to explain in detail. First of all, I would like to state that the article mentioned in the air-cooled radiator consists of two parts, one is the heatsink, the other part is the cooling fan, this point must be noted, because we usually air-cooled radiator referred to as the fan, as if the fan's good or bad is the key to air-cooled radiator, in fact, the more not to be ignored, the heatsink also plays a very important role. There are three basic ways to transfer heat: conduction, convection, radiation (from high school physics:-P ). CPU cooler heat sink must be close to the CPU, this way of transferring heat is conduction; cooling fan to bring cold air to take away the hot air, which is convection; temperature higher than the air of the heat sink will be heated by nearby air, which part of it is radiation. From the process of heat transfer, it is not difficult to see that, in order to make the cooling effect is outstanding, it is necessary to ensure that these three ways of transferring heat quickly and effectively. A good air-cooled radiator, then, needs to meet the following three requirements:
Good conduction The heat sink should be made of high-quality materials. Gold and silver have the best thermal conductivity, but the price is too high, I believe that no one will not be used to do the heatsink, pure copper heat dissipation effect of the second, but has been very good, is not there a lot of articles introduce the use of copper to transform the heatsink to accelerate the heat transfer it? However, copper also has shortcomings, high cost, weight, corrosion resistance. So most heatsinks are made of light and strong aluminum, which should be the best thermal conductivity of aluminum alloy, the vast majority of professional audio power amplifier heatsinks are made of aluminum alloy, good CPU air-cooled heatsinks are also made of aluminum alloy, such as Foxconn heatsinks, TT turbine heatsinks, etc., and some miscellaneous heatsinks are made of pure aluminum heatsinks, the thermal conductivity of pure aluminum is very general, and it is very light, and it is very light. The texture of pure aluminum is very light, and the sound is not as crisp as aluminum alloy when you flick your finger. But the price is cheap, this kind of heatsink air-cooled radiator, easy to cause damage to the heat of the CPU, but unfortunately many people are still using it, because it is easy to come, a lot of them are complimentary. In order to accelerate heat conduction, to recommend the use of thermally conductive silicone grease. We know that solid and solid again how tight contact, the same will leave tiny gaps, then the heat in the transfer up will be very slow (this is why the air-cooled radiator clamps if very tight, the cooling effect will be significantly improved reasons). The thermal conductivity of air is very poor (why else would our cotton and down coats be so warm?). Therefore we use thermally conductive silicone grease to fill up the gaps, which accelerates the heat transfer. High quality thermally conductive silicone grease will not dry out, and the heat conduction effect is still very good, thermally conductive silicone grease is cheap, imported slightly more expensive, but can be used for a long time.
Good convection For good convection, you need a cooling fan that can provide enough airflow to ensure that cool air can be constantly replenished. There are two main types of cooling fans on the market: bearing fans and ball fans. Bearing fans are low-cost, but noisy and limited in speed; ball fans are low-noise and high speed, but high-cost. Knowing that the noise of CPU fans has gradually become a problem that cannot be ignored, the lower noise of ball fans at the same speed is undoubtedly a big advantage. In order to make the fan can be in the lower speed to obtain a higher air volume, the latest production of good fans are used in the multi-blade, sickle shape, which can effectively increase the air volume, reduce noise, so it is worth everyone's priority. (Then again, if there is no noise at all, that's not necessarily the best, in case the fan breaks down and you can't hear it anymore, the CPU is more likely to burn, and you can still hear if it's working properly if it's noisy. (^_^) In order to accelerate convection, some coolers in the heatsink base plate to play some holes, so that the fan wind can be blown to the part of the CPU under the pressure of the heatsink, such a novel and practical design ideas, is worth all kinds of fans to learn from a good way. Some coolers have carefully designed the angle of the cooling fins so that the wind can carry away the heat more effectively.
Radiation is good In order to increase the radiation, air-cooled radiator heatsink should have enough cooling area, the cooling area is different from the general sense of the volume and area, it refers to the surface area of the fins, if the fins of the heatsink is very high a lot of fins, then the cooling area can be increased exponentially in exchange for a very good heat dissipation, some radiators will be made into a surface with the surface of the fins with Some heat sinks make the surface of the heat sink with a prismatic protrusion form, is to increase the surface area, improve the transmission of radiant heat. To master the above three points, any one of the air-cooled radiator in front of us, we can roughly judge its strengths and weaknesses to, naturally, can also give a suitable evaluation, compared to our needs, we can understand which radiator is more suitable for them. A while ago a lot of articles reported the G turbo fan, is very consistent with the characteristics described above, from the principle of basically outstanding heat dissipation, large size, large surface area, fins are well-designed, the base plate with ventilation holes ...... decided that it is a good air-cooled cooler, the same way we can use these theories to look at the more advanced of various other fans, the reasoning is the same. Finally, here are some noteworthy factors to consider when shopping for an air-cooled cooler.
1Heatsink shape The cooling effect of the air-cooled cooler is not only determined by the cooling area, with the shape of the heatsink is also very related to the heatsink, the heatsink has a bottom plate, is the thickest used to contact the CPU side. If the bottom plate is too thick, the rate of heat dissipation will be reduced, resulting in a significant temperature difference between the two sides of the heatsink, not conducive to heat dissipation; if the bottom plate is too thin, the thermal stability is poor, the temperature is prone to sudden increase in the phenomenon of lowering the appropriate thickness of the bottom plate is 4 to 10 millimeters, you can pay attention to when choosing the heatsink.
2 the effect of the copper plate Some articles say that in the heat sink lined with copper below, you can improve the cooling effect, I have tested that the method is feasible, but it must be noted that the copper sheet thermal conductivity is quite good, you must try to make the original heat sink and copper firmly in contact with the use of thermally conductive silicone grease, so that in time to dissipate the heat.
3 heat capacity Few people pay attention to this issue, but it does have a great impact, the heat capacity as if the hard disk cache, play a stable and efficient transmission of heat and heat hosting role, a good heatsink should have a certain heat capacity, the quality of the heatsink heat capacity is high, copper material is more prominent (copper, also known as red copper, that is, pure copper, brass is a copper alloy, thermal conductivity is not good).
4 double fan with a double fan, it is safer than a single fan, in the event that a fan is broken, the other one can also work, and at the same time can bring a greater amount of wind, but unfortunately also brings a lot of noise, in addition to the two fans itself, the noise will also produce a lot of airflow whistling, if you are very headache on the noise, it is recommended that you do not choose a double fan.
5 Fan speed Fan speed is measured in rpm (revolutions per minute), so if a fan is spinning at 6,000 rpm, it can rotate 100 times a second! The same is true for the speed of a hard disk.
6 fan power supply The current fan power supply is generally used on the motherboard with the power supply socket, three wires indicate that the speed measurement function, some motherboards also support temperature control, if the CPU temperature is too high will automatically accelerate the fan running, but at the same time if there is a standby mode, it is possible that the fan will stop, which is very dangerous, easy to burn the CPU, there are already a lot of examples of this. Remember to be aware of whether your computer has this feature or not, and turn it off as much as possible if you have it. The safest thing to do is to connect the power supply fan directly to a 12V case power supply, which requires a bit of soldering and other work, and you won't be able to check its speed.
7 temperature estimation If there is no thermometer, we can also use their own subjective feeling roughly estimated, generally speaking, the hand can not feel the temperature of about 20 degrees Celsius, the feeling of a slight temperature of about 35 degrees, the feeling of warmth is about 45 degrees, hot, but can be tolerated probably about 55 degrees, feel hot but can be tolerated for a few seconds is about 70 degrees, feel hot can only be tolerated for a while is about 80 degrees, the feeling of hot, can only be tolerated for a while is about 80 degrees. A time is about 80 degrees, if you smell the paste (hurry to wipe the soapy water to deal with it, so hot also dare to touch), it is estimated that more than 300 degrees
This post is from the Zhong Guan Cun online product forum