Does hdr affect game frame rate?

hdr will affect the number of game frames, but the specific impact depends on the game implementation; if hdr is not turned on at all, the color depth of the rendering object can be 8 bits, the most common one is r8g8b8a8 format; if hdr is turned on, The accuracy of some rendering objects in the middle of the pipeline needs to be improved.

#The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

Does hdr affect game frames?

Influence.

It depends on the game implementation

If you don’t turn on hdr at all, just use 8 bits for the color depth of the rendering object (all between 0-1 ). The most common is the r8g8b8a8 format. Reading and writing each pixel requires exactly 4 bytes of bandwidth overhead. If HDR is turned on, the accuracy of some rendering objects in the middle of the pipeline will be improved.

For example, pull to r16g16b16a16, which is equivalent to half precision (of course you can also use r32g32b32a32 single precision, but it is not necessary and the overhead is too much). In this way, the bandwidth overhead of reading and writing each pixel is directly doubled. Of course, there are formats like r11g11b10 that support hdr without increasing bandwidth, but this accuracy is still limited compared to rgba half, and the alpha channel is gone, so if you have information to save, there is no way.

In short, the current growth rate of graphics card bandwidth is far slower than floating point computing power, and it can easily become a performance bottleneck at high resolutions. Texture sampling is actually very expensive (relatively speaking). That being said, there are actually games that even if your display screen is not HDR, the entire pipeline still follows HDR, and is mapped to the SDR color gamut when it is finally output to the screen. In this case there should be no difference in performance.

Related expansions:

1. Even if the game settings do not support turning on HDR, even if it is not turned onwin11With the "Auto HDR" function, there is a clear difference in the screen feel when HDR is enabled on the screen and when SDR is used.
Take "Dead or Alive 6" as an example. When HDR is turned on and HDR is turned off, the brightness of the game does not change significantly. However, the contrast of the game picture with HDR turned on seems to be higher, and the picture looks clearer and more textured.

2. Win11 will have an "Auto HDR" option after turning on HDR. For some games, the Win11 system will pop up a box to remind you whether you want to enable this function when entering the game, but "Auto HDR" This function, according to the actual test in "Dead or Alive 6", is a useless garbage function. This function does not allow unsupported games to adapt to HDR, it just simply increases the brightness.
Tomahawk 500 will not cause color distortion when HDR is turned on to play "Dead or Alive 6". However, when HDR is turned on and "Auto HDR" is enabled in win11, the game screen will be white and bright (just like taking a photo). exposure), it will make the color and contrast look wrong.
So for computers whose screens support HDR, you can enable HDR in win11, but it is best not to use "Auto HDR".

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