What is the maximum resolution that VGA cable can support?

The maximum theoretical resolution supported by VGA cable is 2048×1536. However, in practical applications, due to a variety of factors, VGA cables usually can only better support 1920×1080 resolution. The main reasons are as follows:

• Signal transmission characteristics: VGA transmits analog signals, which are susceptible to interference. As the resolution increases, the signal quality decreases, and the image may appear fuzzy, color deviation, flicker and other problems. At 1920×1080 

resolution, signal interference is relatively acceptable and basic image quality can be guaranteed.

• Hardware compatibility: VGA interface and related circuit design of devices such as graphics cards, monitors and projectors may not work perfectly at high resolution. Although some older devices support VGA interfaces, they do not support high resolutions such as 2048×1536, and 

even if they use a high resolution signal source, they cannot be displayed normally.

• Bandwidth limitation: The bandwidth of the VGA interface is limited, and the high resolution requires a wider bandwidth to transmit data. The resolution of 1920×1080 requires bandwidth within the range of the VGA interface, while the resolution of 2048×1536

 requires bandwidth beyond the capacity of some VGA devices, resulting in incomplete or unstable data transmission.

In addition, the quality of VGA cable will also have an impact on the transmission resolution, good quality line can better ensure signal transmission, to a certain extent, help improve the resolution performance. But in general, VGA cables do not perform as well 

at high resolution as digital interfaces such as HDMI and DisplayPort.