Wireless network cards are easy to ignore when buying notebooks. Compared with processors, memory, graphics cards and hard disks, wireless network cards are almost unsatisfactory, and few manufacturers mention the wireless network card model used by their products. You may have encountered this situation: why the mobile phone can be connected to 5GHz, but your notebook can only search for a 2.4GHz signal; when playing the game, the ping value is unstable, while the roommate has no problem. These situations are related to wireless network cards.
Notebook wireless network card
Below we focus on the types of wireless network cards in the notebook, which is relatively old and various USB external wireless network cards.
· The interface of the wireless network card
There are currently two common wireless network card interfaces, one is MINI PCI-E, and the other NGFF (that is, M.2). MINI PCI-E appeared in relatively older notebooks, and the notebooks in recent years have basically adopted NGFF. Common MINI PCI-E wireless network cards have a length and width of 27mm × 30mm. The long length of common NGFF wireless network cards is 22mm × 30mm, which is consistent with the 2230 specifications.
mini PCI-E wireless network card
NGFF wireless network card
In addition, many ultra -thin notebook wireless network cards are directly packaged on the motherboard and cannot be replaced.
· Frequency band of wireless network card
The word frequency may be a bit strange, in fact, the 2.4GHz and 5GHz that everyone often says. It should be noted that the 5GHz here and the 5G discussed by you are two codes. 5GHz refers to the wireless frequency band running in 5GHz, which is theoretically faster than 2.4GHz.
Some older notebooks use the older wireless network cards and do not support 5GHz, so some friends encountered in the beginning: the notebook cannot be searched for 5GHz WIFI, but the mobile phone can be found. If you want to connect to the old device 5GHz, you can only change the wireless network card.
The advantages and disadvantages of 2.4GHz and 5GHz
At present, most new notebooks will support 2.4GHz and 5GHz WiFi at the same time. The disadvantages of 2.4GHz are that the signal frequency width is narrow and more device. For example, home appliances and wireless mouse are connected by 2.4GHz, so the signals are more complicated and there are interference. However, due to the low frequency, the distance between the propagation, and the more performance of the wall.
5GHz is relatively stable and fast because the frequency band is wide and less interference. Due to the high frequency of 5GHz, the communication distance is not far away, and its coverage and wall -piercing ability are not as good as 2.4GHz.
· The highest speed of the wireless network card and TX/RX Rate
Under normal circumstances, wireless network card manufacturers are marked on the official website to clearly clearly clear the maximum speed of a wireless network card. This maximum speed does not mean the network speed you can reach, only the speed limit of this wireless network card. There are currently four common speeds, including 300Mbps, 433Mbps, 867Mbps, and 1.73Gbps. The larger the value, the higher the maximum speed. The basic 300Mbps is similar to the concept of broadband, and the highest network speed is about 37.5MB/s (300 ÷ 8). If the home is a 500m broadband, then only 300Mbps wireless network cards are obviously delayed.
Example of Intel wireless network card specifications
TX/RX Rate is a little “unpopular” point. TX refers to sending, RX refers to receiving. There are two types of TX/RX Rate, which are common in notebook wireless network cards: 1 × 1 and 2 × 2. 2 × 2 means that there are two sends and receiving antenna. The more antennas, the faster the theoretical transmission speed.
Is it necessary to upgrade the wireless network card?
In addition to the basic knowledge of wireless network cards above, there are also 802.11ac standards, MU-MIMO technology, etc. These are very important parts of wireless network cards, but because they are more complicated, and ordinary consumers are replacing network cards, it is very very very very good at changing network cards. You need to consider these less, so let’s not mention it.
If there is no problem with normal use, after reading the article, I found that the positioning of wireless network cards is relatively low -end, then there is no need to change the network card at all. In the following situations, you can consider upgrading the wireless network card:
1. 5GHz WiFi must be connected. The 2.4GHz signal of some wireless routers is very poor. If this is encountered, it happens that the notebook only supports 2.4GHz WIFI, you can consider changing the wireless network card;
2. The ping value in the game is too high. Some products with relatively low -end positioning will occur during the game. If it is not a problem with the wireless router, you can replace the higher -positioning wireless network card;
3. The download speed does not reach the upper limit of the broadband. This situation is because the maximum rate of the network card is lower than the broadband, so it is a better choice to replace the wireless network card.
I will explain how to judge whether a wireless network card is good or bad, and how to choose a wireless network card.