Hello, everyone, and it was next. I had finally installed my new ITX Cannon computer after a series of twists and turns over the weekend, and I also published an article to share my experience with you.
However, although the performance of the steel gun burst, but there are still a few fly in the ointment, which is the most disturbing is the CPU temperature, also wrote in the last article, this machine uses the i7 6700K in Prime95 28.9 the second roasted In chickens, although it can be operated stably, when using Master Lu to monitor the temperature, it is found that the temperature is relatively high, the peak temperature of the CPU surface can reach 70-71 degrees, the stability is generally in the range of 67-69 degrees, and the core temperature once reached as high as 81 degrees leads to Master Lu. Alarm, radiator I was using a pirate ship H100i v2 and the original 240 cold row of fans replaced by 2 cat fans, in theory, absolutely impossible to suppress a single over 4.5GHz, voltage 1.24v 6700K, but why the temperature Still high? Here we have to mention Intel's very disgusting practice.
From the appearance point of view, the CPU consists of three parts: the PCB board, the core die, and the metal top cover. In fact, you won't see the die when you get the product. You only see the PCB covered with a metal top cover. In addition to protecting the vulnerable core die, this top cover functions to dissipate heat. When the CPU is fully loaded, the heat of the core die is very large, and the heat of the die must pass through the metal top cover to reach the heat sink base. . In Sandy Brige’s time, Intel’s advanced brazing technology between the metal cap and the core die was to use a metal material with a lower melting point than the parent metal as the brazing material, heating the weldment and brazing material above the brazing material. The melting point of the material, which is lower than the melting temperature of the base metal, wets the base material with the liquid solder, fills the gap of the joint and interdiffusion with the base material to realize the method of connecting the weldment. As a result, the solder between the top cover and the core is metal, and the thermal conductivity is high, and naturally the core temperature can be quickly transmitted to the top cover. In the era of Ivy Brige, Intel began to reduce costs. The Ivy Brige series of CPUs do not use brazing between the top cover and the core. Instead, they use ordinary phase change silicone grease. As a result, the thermal conductivity of silicone grease is relatively Brazing is very low, it causes the CPU core temperature can not be quickly transmitted to the top cover, but also can not quickly pass to the radiator base - even if your radiator is again cattle X, heat transfer to the radiator is no good , not to mention silicone grease is not permanent, with the use of time, some components of silicone grease will slowly volatilize, usually use one or two years are to be replaced, or silicone grease will be "dry" out, The silicon grease inside the CPU is obviously not so good. Silicon grease technology also leads to another problem: CPU temperature is high and low, and everyone who plays with computers knows that the role of grease on the heat sink is not pure heat conduction. It is mainly used to fill the heat sink between the CPU and the CPU. In the case of an uneven surface, the base of the heat sink must be closely pressed against the surface of the CPU in order to conduct heat well. The top cover of the silicone grease CPU is glued on the PCB board with a glue similar to 704 glue. From the process point of view, there will be some errors. Some top cover pressures are relatively tight, and the heat dissipation of the CPU will be relatively good. A little looser, there will be an unfavorable temperature situation, coupled with the core physical problems, the difference is even more obvious.
Brazing process CPU
6700K is the sixth generation of Core Duo, using a 14nm process, the overall TDP is only 95W, more efficient, before the Skylake has yet to market, once there was rumors that Intel finally returned to the brazing technology in the sixth generation of CPU, everyone It's safe to eat, but the ideal is good—how can Outel, a toothpaste factory, easily come up with such a good thing? After the listing of the 6700, the evaluation organization opened its teeth and found that - um, it is still cheap silicone grease. The result is that although Skylake's 14nm process improves performance and reduces power consumption, the effect of using silicone grease to contact the top cap is further reduced because the die area becomes smaller—that is, the 6700 is more than the previous-generation temperature at full load. Even higher.
There are a lot of long talks and the result is that although my 6700K has a good constitution, but the temperature is not ideal, but the wisdom of the people is endless, the products of the deputy factory are endless, after the silicone grease U appears for some time, the people will Invented the “open lid†method, which is to remove the top cover of the CPU by itself. Some players choose to use the heat sink base to directly contact the core die to get better heat dissipation performance after removing the top cover, but after all, the core die is very Vulnerable, without the protection of the metal top cover, the pressure of the heat sink fastener is also very easy to crush the CPU's PCB board. Later, there was a German company Coollaboratory that developed a new type of heat-dissipating medium called “liquid metal.†The name seems to be very high, but it is not really liquid, or it will not flow when the CPU is turned on. Actually, the form of liquid gold is more like paste-like metal. It is said that it should be a more complex mixture of niobium alloys. Because it is a metal, the thermal conductivity is much higher than that of silicone grease, and there is no volatilization problem. Many enthusiasts are replacing it. After the liquid gold all said that the temperature dropped suddenly, so I also gritted his teeth and decided to open the lid and replace the liquid gold to try the cooling effect.
These are the materials and tools used to open and replace liquids. The needle-like material is of course the main character of the Coollaboratory Liquid Ultra. The white vial is an insulating paint, and the black one is the CPU opener. First use the opener to remove the top cover of the CPU. Because I forgot to take a photo, I had to borrow someone else's photo.
Basically this is the position of the open lid, put the CPU in the middle of the opener, and then the slider to withstand the edge of the metal top, and continue to slowly tighten the screws until the metal top out of place, the operation is very simple, but the actual coating The amount of glue, when you open the lid still need to be very strong gas screw, although sometimes strong enough to miracle, but the lid is still a little cautious, if you feel it can not be fixed, you can first loosen the CPU and then turn 180 degrees, Try slowly and be patient. Prior to the opening of the lid opener, players usually open the lid and use a razor blade to cut the sealant, or use a vise to clamp the lid (the principle is similar to the lid opener). The blade does not say anything, the operation is difficult and easy to shovel Fly the capacitance on the PCB board, and due to the unbalanced force of the vise, it is very easy to break and damage the PCB board, especially on the basis that the 6700 PCB board is thinner than the previous CPU. As a result, players have developed and mass-produced this kind of decapper. The CPU is up and leveled and balanced, which greatly reduces the difficulty of opening the lid. It is important to remind that you must not be afraid of the wear of the contacts on the bottom of the CPU or The fear of squeezing the PCB board and inserting paper towels or other buffers on the CPU will cause uneven forces, which in turn will easily damage the CPU. In addition, if you use a blade to slightly cut the outer sealant before using the lid remover, opening the lid is easier, but it is not a necessary step. The only difference is that you need more energy.
After the 6700K is turned on, it is this urine, all evil silicone grease, and from the trace point of view, this grease is quite thick, no wonder 240 cold row can not suppress, use alcohol swab to wipe off the residual grease, and then you can Find an unused bank card or any other card and start scraping the remaining sealant. This step cannot be saved. The cured sealant is difficult to close together. The residual sealant will cause the top cover to The increase in the gap between the core dies, resulting in poor heat dissipation. Residual sealants only need to be careful to avoid the capacitance on the PCB board, it is not difficult, try to clean.
Next, apply the insulating protective paint around the core before applying liquid gold, because the liquid gold has a little fluidity after all, although it will not leak out during use, it may still be covered during installation. Squeeze and overflow some, 6700K's core is surrounded by four capacitors, liquid gold conductive, in order to prevent short circuit, coated with insulating paint to cover around you can rest assured. The application of liquid gold is not the same as silicone grease. Never use a 9-point method to apply silicone grease. It will not be fully covered. A small brush for liquid gold will be included in the liquid gold set. The needle squeezed about 1-2 rice grains of liquid gold on the core, and brushed the entire core with a small brush, roughly to the middle of the thick, slightly thin around, if you feel less can be squeezed out to brush out But don't overcoat it. If you accidentally overfill or drip out, use the included cleaning sheet (actually alcohol swab) to erase. In addition, it is very convenient to wipe off the silicone grease on the alcohol cotton disc. It is also possible to handle small wounds. It is recommended that you prepare some at home.
After the liquid gold is applied and the insulating paint is dry, the metal top cover can be reinstalled. You can buy 704 glue like I do and stick it back again. You can also use ordinary double-sided tape (thin, not 3M thick). Fix the metal top cover on both sides. When the temperature is high, the viscosity of the double-sided tape will increase, so there is no need to worry about the problem of sticking. Here to say is that the 6700K roof material is actually nickel-plated copper, in fact, does not constitute a thermal bottleneck, Taobao, although there are pure copper to replace the top cover for sale, I personally think that taking into account the process error and other issues , Or use the original cover more reliable, of course, pure copper has a higher thermal conductivity and pure copper top cover and mirror process, whether to use or see it.
Another thing to note is that some players use liquid gold instead of silicone grease inside the CPU to replace the grease between the top cover and the heat sink base. However, the components of liquid gold react with aluminum to corrode the aluminum. Products, so if your radiator base contains aluminum or aluminum, please don't use liquid metal to fill, and don't inadvertently stick liquid gold to the heat sink's aluminum fins during the process of coating liquid gold.
After the steps are relatively simple, after the sealant almost solidified, you can install the CPU back to the motherboard, the same 9 o'clock method to apply a good grease, put on the cold head, a good screw, and then arrange the alignment, cover Can I try to light the lid? (At this point, I am very embarrassed. If I don't shine, I can only buy a new 6700K. If I don’t use the money, I’m not able to speak about my physical quality and heat dissipation. Didn't come back to post it?)
After the successful boot prompts a new CPU, enter the BIOS to see a no problem directly restart it, and then we come to run a P95 to see the temperature is still 28.9 second, roast chicken after 40 minutes, wow rub! This temperature is against heaven! The core temperature is stable at about 67 degrees, and the surface temperature is about 56 degrees, which is 10+ degrees lower than before! The temperature of the middle CPU of roast chicken is only reached 62 degrees, the result is very ideal!
By the way, look at the 3DMark results that I ran yesterday. Asustek's card is still very powerful. After the ASUS GPU Tweak II is overclocked, the score is quite good. The peak temperature is about 74-75 degrees, which is higher but still Accepted, after all, usually will not be overclocked full use.
The above is the process of replacing the liquid gold with the CPU opening cover. The actual test replacement liquid metal has a huge improvement in the heat dissipation performance of the silicone grease-filled CPU. However, the actual increase in the number of specific still depends on the original state of the CPU, if the original cover The gap between the core and the core is very small. Even if the grease grease U can not escape the bad temperature, even if you replace the liquid gold, you may not be able to improve the quality of this. If you want to enhance heat dissipation, you need to analyze yourself. The condition and needs of the machine.
At the end of the day, I still want to say: There is a risk to open the cover. Take care when disassembling U! Although there is a convenient tool to open the lid artifact, but still can not be said to be 100% insurance, if the open is broken, an i7 2K + even if scrapped, and there will be no warranty and open the lid itself will let you lose the warranty Qualification, so if you do not pursue good-looking data or extreme performance, or ability is not very strong, it is recommended that you still carefully choose to open the liquid gold exchange method to enhance cooling efficiency, and other online businesses to provide a Covered service and said bad package, but first, unless it is your local business, otherwise you need to send the CPU to handle, and then I have not used the open cover service, but I personally think that the compensation of the CPU must not be original National Bank boxed, coupled with scattered quality of the patch, it is recommended that you carefully choose this type of service. Thank you for watching! I wish your computer can play smoothly!
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