There are several notebook wireless card which is necessary to upgrade it
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Wireless LAN is a lot of friends to buy a notebook easy to overlook the part, compared to the processor, memory, graphics card and hard drive, wireless card hardly optional, and few vendors mention wireless card models used in their products.
You may encounter this situation: Why phone can connect to 5Ghz, and can only search your own laptop to 2.4Ghz signal; play the game ping values are not stable, and the roommate did not have a problem. These cases will be associated with a wireless network card.
Here we focus on talk about common type of wireless card in a laptop, more ancient columns and various external USB wireless network card is not on.
Wireless LAN Interface
Current common wireless network interface, there are two, one is the mini PCI-E, another NGFF (ie M.2).
mini PCI-E appears in older notebook, but in recent years have adopted the basic laptop for NGFF.
Aspect common mini PCI-E wireless card is 27mm x 30mm, long section of the common NGFF wireless card is 22mm × 30mm, 2230 consistent with the specifications of the solid state drive.
mini PCI-E wireless card
NGFF wireless card
In addition, many of the ultra-thin notebook wireless card directly encapsulated in the motherboard and can not be replaced.
Band wireless network card
The word frequency band may be a bit strange, in fact, we often say 2.4Ghz, 5Ghz. It should be noted, 5Ghz here and we discussed 5G are two different things, 5Ghz is called the 5th Generation of WiFi, which is the fifth generation of WiFi, the theoretical speed faster than 2.4Ghz.
Some older models of notebook uses an older wireless card does not support 5Ghz, so there is a problem begins with some friends encountered: a notebook found less than 5Ghz WiFi, but can be found to the phone.
Want to make old equipment connected on 5Ghz, only for the wireless card.
目前绝大多数新笔记本都会同时支持2.4Ghz和5Ghz WiFi，2.4Ghz的缺点在于信号频宽较窄，设备比较多，比如家电、无线鼠标都是通过2.4Ghz连接，所以信号较为复杂，存在干扰。但由于其频率较低，传播距离更远，穿墙性能更强。
5Ghz由于频带较宽，而且干扰少，所以网速比较稳定、快速。由于5Ghz的频率较高，传播距离并不是很远，其覆盖范围和穿墙能力都不如2.4Ghz。
无线网卡的最高速度和TX/RX rate
一般情况下，无线网卡厂商都在会官网上标注清楚一款无线网卡的最高速度，这个最高速度并不代表你能够达到的网速，只代表这款无线网卡的速度上限。
目前常见的最高速度有四种，分别为300Mbps、433Mbps、867Mbps和1.73Gbps。数值越大，代表最高速度越高。
其中300Mbps基本和宽带概念差不多，最高网速大约为37.5MB/s(300÷8)。如果家里是500M的宽带，那么只支持300Mbps的无线网卡明显拖后腿。
TX/RX rate稍微“冷门”点，TX指的是发送，RX指的是接收。笔记本无线网卡常见的TX/RX rate有1×1和2×2两种，2×2意思是发送和接收天线各有两个，天线越多，理论传输速度越快。
无线网卡有必要升级吗
除了以上关于无线网卡的基本知识外，还有像802.11ac标准、MU-MIMO技术等，这些都是无线网卡中非常重要的部分，但由于比较复杂，而且普通消费者在更换网卡的时候，很少需要考虑这些，所以再此就不提了。
如果正常使用没有问题，看过文章之后才发现无线网卡的定位较为低端，那么完全没有必要更换网卡。以下几种情况可以考虑升级无线网卡：
1、必须要连接5Ghz WiFi。一些无线路由器的2.4Ghz信号非常差，如果遇到这种情况，恰巧笔记本只支持2.4Ghz WiFi，可以考虑更换无线网卡;
2、游戏中ping值太高。一些定位较为低端的产品，在游戏过程中会出现ping不稳定的情况。如果确实不是无线路由器的问题，那么可以更换定位更高的无线网卡;
3, the download speed will not achieve the broadband limit. This happens because the highest rate is less than the width of the card, the wireless card replacement is a good choice.