Can DP to HDMI be used at 144Hz?

2021-05-28 16:27:55 ekL

The difference between HDMI interface and DP interface

       Both the HDMI interface and the DP interface are compatible with multiple resolutions and refresh rates, but because their transmission methods are different, the refresh rate under each resolution may not be the same; HDMI uses the TMDS transmission method, and the image output by the graphics card After the signal is converted by the TMDS chip, it is transmitted to the display line by line through a dedicated line. The transmission method of DP is to pack the image into a data packet and then directly transmit it to the display. The transmission of the DP is in a packaged way. A very clever way, because not only the video signal can be put in the data packet, but also other signals can be put in it. For example, HDMI needs a separate wire to transmit HDR data to achieve HDR, while DP does not need to add a separate wire, and the DP interface can be connected in series, connecting another display from the display interface, although this function can only It can only be realized on DP2.0, but these functions are not realized by HDMI.

Can DP to HDMI be used at 144Hz?

       Before answering this question, let’s take a look at the difference between the DP interface and the HDMI interface. In 2009, DP released version 1.2 with a bandwidth of 21.6Gbit/s, 1080P resolution@240Hz, 2K resolution@144Hz, 4K resolution@ 60Hz; HDMI2.0 was released in 2013, bandwidth 18Gbit/s, 1080P resolution@144Hz, 2K resolution@100Hz, 4K resolution@50Hz; if your computer and monitor both support DP1.2 and HDMI2.0, At 1080P resolution, you can directly connect a standard DP cable or a standard HDMI cable directly to the computer and monitor to get 1080P@144Hz; if it is greater than 1080p, you can only connect to DP; or use the DP1.2 version with the chip to switch If it is HDMI2.0, then DP to HDMI can be up to 144Hz at 1080P resolution; if it is greater than 1080P resolution, it can’t, because the DP bandwidth is larger than HDMI at this time, and the resolution and refresh rate are both high. Under the circumstances, HDMI may be affected due to insufficient bandwidth.

DP1.2 and HDMI2.0 comparison chart

DP1.2 and HDMI2.0 comparison chart

       With the development of technology, DP1.4 was released in 2016 with a bandwidth of 32.4Gbit/s, 1080P resolution@240Hz, 2K resolution@240Hz, 4K resolution@120Hz; HDMI2.0 was released in 2017, bandwidth 18Gbit/s , 1080P resolution@240Hz, 2K resolution@240Hz, 4K resolution@144Hz; at this time you want to achieve 144Hz at 4K resolution, and your computer and monitor both support DP1.4 and HDMI2.1, then you only You can choose the HDMI2.1 version of the cable for direct connection; if you want to achieve 144Hz at 1080p and 2K resolution, then you can choose one of the two interfaces, but if your display only has HDMI2.0, there is no DP interface , And your host has DP1.2 or 1.4 interface, you can also use DP to HDMI on 1080P@144Hz at most.

DP1.4 and HDMI2.1 comparison chart

DP1.4 and HDMI2.1 comparison chart

       In general, whether DP to HDMI can be up to 144Hz, mainly depends on the HDMI version and DP version. The situation of DP to HDMI can be up to 144Hz is as follows: DP1.2 to HDMI2.0 can be up to 1080P@144Hz, and DP1.2 to HDMI2. 1 Can be used for 1080P@144Hz, 2K@@144Hz; DP1.4 to HDMI2.0 can be used for 1080P@144Hz, DP1.4 to HDMI2.1 can be used for 1080P@144Hz, 2K@@144Hz; finally we are buying an adapter cable or When converting the head, be sure to consult whether it supports 144Hz, because some DP to HDMI conversion chips do not support 1080p@144Hz, 2K@144Hz conversion.