Many users have experienced a problemoverheating in their computers, and if stationary machines can be equipped with and additional cooling, laptops do not have this advantage. A year or a half after the purchase, they start to overheat, and the cooling pad does not help either. What's the matter? It's simple: it's time to change the thermal interface.
Any thermal interface is designed to transmitheat between two objects, it must have low thermal resistance and high thermal conductivity, as well as zero electrical conductivity, low fluidity and the ability to maintain its properties at temperatures close to 100 degrees Celsius. What is better - thermal paste or thermal padding? The thing is that they have different purposes.
For a long time the only thermal interface wasthermal grease, familiar, perhaps, to all. This viscous composition in the form of a cream (paste), not conductive current, was used and applied to all computer parts that need cooling: video cards, chipsets and radiators. Over time, there were other thermal interfaces: thermal pads, hotmelt glue and even liquid metal, in view of this there is a lot of confusion. Each type of thermal interface has its own characteristics, so even a common question about what is better - thermal paste or thermal padding, can be solved by the user, because they just have different purposes.
On the Internet there are otherThe names of this type of thermointerface are: thermal rubber, chewing gum, thermo rubber. Their main task is to fill the space of more than 0.5 mm. In the modern market, copper plates appeared that supposedly can replace thermal pads, but this is not the case: copper is inelastic and will not be able to guarantee a uniform fit over the entire surface. In addition, the surface of the chip and the bottom of the radiator, although polished, still have some irregularities, and besides simply filling the gap between the parts, it is necessary to smooth out roughness and small irregularities: this function is performed by paste or thermal padding.
What to choose as an alternative?In the event that it's still decided to use a copper plate, it needs to be ground well and adjusted, so when buying it is better to take a sheet a little thicker than necessary. Using a thin layer of thermal paste on both sides is also necessary to fill the microcracks.
Features of Thermal Towels
Sometimes it is possible to meet the assertion thatThe thermo-adhesive is used for gluing, fastening two parts, if there are no other methods. This is misleading, because in such cases, hotmelt is used. Thermal ditches, as a rule, are used for the power supply of the processor, as well as for memory chips on video cards and motherboards.
On it as it is possible to "plant" and the southern bridge in view ofThe fact that the temperature of this part increases evenly, without jumps, and in general is not as high as on the processor, so the question of what is better - thermal paste or thermal padding - is incorrect: paste can not perform the same functions.
Hot melt glue
This term is called a special composition,which does not conduct an electric current. It has a high index of thermal conductivity and serves for attaching to the video card small radiators, processor power subsystem and so on. Hot melt does not dry out for a long time, however, it can not always provide a quality fastening, and its thermal conductivity is much lower in comparison with other types of thermal interface, which is quite logical, given that this product has a different purpose. It is recommended to use it only if you can not attach the heatsink base to the processor with anything else.
Another kind of thermal interface, which, by the way,has an excellent indicator of electrical conductivity, because it consists mainly of metal. Nevertheless, among enthusiasts it is very popular, because in liquid metal, the heat conductivity and thermoresistance are much higher than for any other thermal interface. Before applying the heat spreader, the processor cover and the radiator base must be degreased, after which it is possible to rub the liquid metal. The layer should be very thin. Rubbing should be done until the fluid composition ceases to be fluid.
This interface is the most efficient, butIt is extremely inconvenient to apply and remove it. Before use, make sure that the base of the cooler is copper or nickel-plated, as the liquid metal reacts with aluminum alloys.
Replacement of thermal interface
When buying a new thermal paste follows first of allpay attention to its consistency: it should not be either too liquid or too thick, because in the first case there will be no necessary contact, and in the second case it will not be possible to apply the composition in an even thin layer. Computer masters most often use thermal paste MX-4 or KPT-8.
However, the first step is the removal of the oldcomposition. If the last shift was made more than a year ago, it is necessary to separate the radiator very carefully, because if the paste or thermal cushion is withered, with inaccurate handling, you can simply "tear out" all the details.
Особенную осторожность следует соблюдать при replacing the thermal interface in laptops, starting from the disassembly stage. The fact is that the processor chip is not protected by metal there and is very sensitive to damage. If the previous thermal grease had an admixture of aluminum chips, it is necessary to avoid contact with other parts, because this can cause a short circuit.
In no case can not use siliconethermal grease, as it has a very low rate of heat sink and, moreover, dries very quickly. Such a paste needs to be changed more often, otherwise the device may break due to constant overheating.
What is better - thermal grease or thermal pad forlaptop? Usually in compact computers, all parts fit tightly together, so there is no need to use thermal pads, but before you make a choice, you need to check the gaps.
When applying thermal paste, you must remember thatthe composition should lie in a thin uniform layer, without gaps and bubbles. The amount of paste, on the advice of computer masters, should be a little more than a match head. Here is no longer better. The thermal interface should be distributed over the surface with a special spatula, and it is necessary to apply it only on the heat distribution cover of the processor.
Good thermopaste change every two to three years,bad - once a year, but when cleaning the laptop from dust, you still need to change it, even if the expected service life has not yet come to an end. In stationary computers, you do not need to remove the radiator during cleaning, so the thermal interface does not suffer, but the masters still say (regardless of whether there is a thermal pad or thermal paste) that it is better to replace at the same time.
What is better - thermal paste or thermal padding?For a video card, the answer is unequivocal: option two. In order to substantiate the answer, it is not necessary to contact the computer master, it is enough just to know the gap between the two parts. In the case of a radiator for a video card, this is usually just over 0.5 mm.
To install the thermal pad, you need to cutthe desired piece, the size corresponding to the chip or slightly larger than it. Then remove the film from the surface of the thermal pads. Fold a piece into a roll-like or bend and start laying at one of the edges to prevent air from entering (resembling the process of gluing the protective film to the screen of a phone or tablet). After this, it is necessary to separate the second, ribbed film from the thermal pad. The process is completed, you can install a radiator.
Without knowing the parameters
Many manufacturers say that pasta is better orthermal pads of the same companies that they used, however, such a moment as the gap between the heat-spreading lid and the radiator cannot be found in the description of the technical characteristics of the computer, therefore there is an instruction how to replace the thermal interface without knowing the thickness.
First, according to the above instructions, you needInstall a gasket 0.5 mm thick and attach a radiator, then unscrew and remove it again to check if the thermal padding is pressed. If there is a deformation area, then everything is in order, and you can simply put the radiator back.
If pressure does not occur, you need to cutone more piece of thermal pads of the same size and install in a similar way over the first one, then reattach the radiator and remove it to check the degree of pressure. Repeat this process until the deformation region appears.
If the instruction is followed, then the total thermal conductivity of two or more thermal pads will be no worse than one.
With your own hands
It has long been freely available almost inEvery computer store has a wide variety of products. There can be purchased or hot melt, or thermal pad, or thermal grease. What is better - to buy or do manually? The fact is that a self-made thermal pad can be made from ordinary thermal paste and medical bandage.
The cost of chewing gum is relatively low,given the long service life, but sometimes it happens that there is no opportunity to purchase it. To make it autonomously, you need a medical bandage (the smaller the mesh, the better) and thermal paste (preferably two, viscous and liquid). The second option: a plate of copper or aluminum and polishing material for them.
First you need to cut the appropriate sizepiece of bandage with a margin of 3-5 mm. Smear the sliced pieces with thermal grease. This should be done carefully so as not to damage the bandage fibers. Such a "grid" gives the thermal paste rigidity, and it will not spread even with strong heating, although heat transfer suffers from the use of a bandage. Before applying new gaskets on the parts, you should smear them with a thin layer of thermal paste to facilitate installation. Then cut off all the excess with scissors and tamp with a thin screwdriver.
Instead of bandages, you can use copper oraluminum. To do this, using metal shears, cut plates of metal, polish them well and install in the same way, after removing the remnants of old gaskets and smearing the surface of the chips with a thin layer of thermal paste. User tests show that the copper plate gives a gain of three degrees compared with aluminum, and five degrees compared with bandages. Factory thermal pads lose properly installed plate of copper by ten degrees, but it should be remembered that, as a rule, these products are not the best.
Many manufacturers now sin becauseinstead of thermal paste, they use thermal fuses on all the parts that need a thermal interface. Yes, installation is much simpler in installation, so they can be understood: production optimization and the like. What is better - thermal paste or thermal padding? For the processor, the latter is not the best option, especially if we talk about laptops, because the thermal conductivity of the gum is lower than that of a paste, and the distance between the processor and the radiator sole is very small. Since the thermal gasket usually has a thickness of about 0.5 mm, with such a strong compression it will deform and lose most of its properties. The maximum allowable compression ratio is 70%.
Having clarified the purpose of each type of thermal interface, you can easily understand whether paste or thermal padding is needed. What is better to choose depends only on the functionality.