Many computer novices may not pay much attention when buying computers. The salesman will buy whichever one is easy to use. In fact, there are some points we need to pay attention to. Here are my notes on purchasing computers, which I share with you!
Precautions for purchasing computer
1. Clarify user requirements
Before buying a computer, first determine the purpose of the user's purchase of the computer and what work the computer needs to do for it. Only by clarifying the purpose of your purchase can you establish a correct purchase scheme. The following lists several different computer application fields to introduce their respective purchase schemes.
(1) business office type
For office computers, the main purpose is to process documents, send and receive e-mail and tabulation. The required computers should be stable. In business office, it is very important for computers to run stably for a long time. It is recommended to configure an LCD display, which can reduce the harm to human body caused by using the computer for a long time.
(2) types of home internet access
In ordinary families, the main function of using computers to surf the Internet is to browse news, process simple words, play some simple games, watch online videos, etc. in this way, users do not need to configure high-performance computers. Choosing a medium and low-end configuration can meet the needs of users. Users can't feel the slow running speed of the software.
(3) graphic design type
For such users, because they need to deal with graphics color and brightness and have a large workload of image processing, computers with fast operation speed and high overall configuration should be configured, especially on CPU, memory and graphics card. At the same time, CRT display should be configured to achieve better display effect.
(4) types of entertainment games
Most of the currently developed games use three-dimensional animation effect, so such users have higher requirements for the overall performance of the computer, especially in terms of memory capacity, CPU processing capacity, graphics card technology, display, sound card and so on.
2. Decide whether to buy desktop or notebook
With the rapid development of microcomputer technology, the price of notebook computers is declining. Many customers who are about to buy computers are considering whether to buy desktop computers or notebooks. For the purchase of desktop or notebook, the following points should be considered.
(1) application environment
Desktop is inconvenient to move. For ordinary users or fixed office users, you can choose desktop. The advantages of notebook are small size and easy to carry. Users who often travel or mobile office should choose notebook.
(2) performance requirements
There is a certain gap in performance between laptops and desktops of the same grade, and the upgradeability of laptops is poor. For users with higher performance requirements, desktop is a better choice.
(3) price
The price of notebooks with the same configuration is higher than that of desktop computers. In terms of cost performance, notebooks can't compare with desktop computers. Therefore, for the purchase of price factors, desktop computers are relatively cheap.
3. Decide whether to buy brand machine or assembly machine
At present, there are two main categories of desktop computers in the market: one is brand computer, and the other is assembly machine (also known as compatible machine).
(1) brand machine
Brand computers refer to computers with registered trademarks and independent brands produced by computer manufacturers with certain scale and technical strength. Such as IBM, Lenovo, Dell and HP are all well-known brands at present. The brand machine has passed strict performance test before leaving the factory, which is characterized by stable performance, guaranteed quality and easy to use.
(2) assembly machine
Assembly machine is a computer that computer accessories sellers combine various computer accessories according to users' consumption demand and purchase intention. The assembly machine is characterized by flexible computer configuration, convenient upgrade and slightly higher cost performance than the brand machine. It can also be said that under the same performance, the price of the brand machine is higher. The choice of brand machine or assembly machine mainly depends on the user. If the user is a computer beginner and does not have a deep grasp of computer knowledge, then buying a brand machine is a good choice. If you are familiar with computer knowledge and intend to upgrade your computer at any time, you can choose to assemble the machine.
4. Understand computer performance indicators
For a computer, its performance is not determined by an index, but by the overall configuration of each part. To measure the performance of a computer, we mainly look at the following performance indicators.
(1) CPU operation speed
The computing speed of CPU is an important index to measure the performance of computer. It is usually described by the main frequency. Now the popular dual core CPU in the market adopts multi-core technology while improving the main frequency speed. The higher the overall main frequency, the faster the operation speed.
(2) graphics card type
The graphics card processes the image data sent by the CPU into a format that can be received by the display, and then sends it to the display screen to form a picture. NVIDIA and ATI graphics cards are popular graphics chips in the market. The capacity of independent graphics cards is used as the scale to measure the performance index of graphics cards. At present, the independent display 256MB is the mainstream graphics card in the market.
(3) memory capacity
Memory is the memory directly accessed by the CPU. All programs to be executed and data to be processed in the computer must be read into the memory first. The size of memory reflects the computer's ability to store information in real time. With the upgrading of operating system and the increasing functions of application software, the demand for memory capacity is increasing.
Related reading: Computer Maintenance Tips
Part 1: don't play games with batteries
In the campus, due to the relationship between space and power supply, notebook has become the main platform of games in the dormitory. Although the battery life of notebook computers has made great progress due to the progress of technology in recent years, we must remember: don't play games with notebook batteries.
The reason for this is not only that the power of the notebook can't last long, but also that the high power brought by the CPU and graphics card during the game has serious damage to the lithium battery of the notebook. Each high-power discharge will cause serious loss to the battery itself. On the one hand, the actual power will be greatly reduced, on the other hand, it will also cause the rapid attenuation of battery life. Nowadays, there are fewer and fewer notebooks with detachable batteries, and the cost and difficulty of replacing batteries have soared. Try not to make a dead attempt for your favorite machine and wallet.
First of all, this object is called "memory module", which is not "running memory" or "internal memory" used to store data. Yes, it's the RAM memory module mentioned in the primary school computer textbook.
To get down to business, the most common interface that is prone to problems in notebooks and desktops is the memory module interface. Once something goes wrong, it will lead to failure to turn on, which is commonly known as "no light at all". Therefore, in general, when we encounter the situation that we can't turn it on, we should first check whether there is a problem with the memory module.
If you are sure that there is something wrong with the memory module, don't rush to buy a new one. You can first find an eraser that can be seen everywhere in the school. Wipe the golden interface part (golden finger) with an eraser to remove the accumulated oxide layer, and then plug it back, it is very promising to regenerate the memory module. If it doesn't work, you'd better turn on your mobile phone and buy one.
In addition, how much memory is enough? Now many cost-effective notebooks are equipped with 4GB memory, which can only be said to be barely enough in actual use. It is recommended to add a memory of the same brand, type and frequency to form a dual channel, which can be improved to a certain extent, and the capacity can reach 8GB, which is completely sufficient for daily applications.
Part 3: methods to enhance heat dissipation
Xiaobai's intuitive impression of the quality of the computer is whether the heat dissipation is good or not, and the heat dissipation also has a great impact on the computer, especially on the notebook. So how to enhance the heat dissipation performance of the computer?
Most laptops use air-cooled heat dissipation system, and some desktops use water-cooled heat dissipation, so there is no need to worry about heat dissipation. One of the major problems of air cooling is the poor heat dissipation efficiency caused by dust deposition, so if you feel that your notebook has poor heat dissipation after using it for about a year, you might as well try to remove the dust. Because the disassembly process is complex, if the hands-on ability is not very good, it is recommended to spend some money to find professionals to avoid internal damage due to carelessness.
In addition, the silicone grease responsible for heat conduction between CPU, graphics card and radiator will also denature after a certain time, resulting in a significant reduction in heat dissipation capacity. Whether desktop or notebook, it is recommended to check and replace silicone grease once every two years. After changing, you will find that the temperature of the machine will decrease obviously.
Part 4: beware of static electricity in autumn and winter
In autumn and winter, the north will be very dry. In addition, people wear more chemical fiber clothes, so it is easy to get charged. At ordinary times, we often encounter a slap when reaching for something, accompanied by an electric spark. It doesn't hurt the human body, but it's not the same.
If the human body touches the computer with static electricity, it is easy to have high-voltage discharge. A voltage of tens of thousands of volts is very dangerous for the circuit of the computer, which is easy to burn the circuit. On the other hand, if the computer carries static electricity, most mainboards will have static electricity protection measures, which will automatically cut off the circuit. At this time, the computer can not be turned on at all, and there is no response when pressing the start button. I've experienced this situation myself. The solution is to disconnect the power supply and stand for a few hours, which will generally return to normal.