I tested playback of Top.Boy.S01E03.1080p - Intro - 1.mp4. I also have NVidia Super Resolution enabled, allowing the video player to upscale this 1080p video to to 4k. Plus I have RTX Video HDR enabled, but it is only active when HDR is enabled. I used the NVidia App to enable those NVidia RTX options, then enabled them in my player.
My video player is MPC-BE. MPC Video Renderer is configured to use DirectX 11, passthrough HDR, enable NVidia Super Resolution upscaling and RTX Video HDR. I have RTSS set with a framerate limit mpc-be64.exe to 47.952 (twice the normal 23.976 framerate used by this video and most movies).
I have SVP RIFE AI set to Fixed 48 fps using AI model 4.18 with performance boost enabled. Allow 10-bit color output is disabled for 4k videos (less than 4k @ 30fps) because my i7-7700k CPU can't handle it. Even with it overclocked to 4.6 GHz on all 4 cores.
NVidia control panel is set to globally enable v-sync = on with low latency mode = ultra.
When my Windows refresh rate is also at 47.952hz (matches framerate limit in RTSS) with 4k RGB RGB 8-bit (no HDR):
- Frames dropped is between 4-6 per video playback loop. I usually see what looks like an un-reported frame drop one time per video loop.
When my Windows refresh rate is also at 47.952hz (matches framerate limit in RTSS) with 4k RGB 422 10-bit (with HDR):
- Frames dropped is between 2-8 per video playback loop. I usually see what looks like an un-reported frame drop one time per video loop.
One time I tried using a 4k with refresh rate at 60hz (with RTSS still limiting to 47.952)
- Watching this video me feel sick with that setup.
When my refresh rate is at 4x DSR for 4k to 1080p at 240hz with RGB 8-bit (no HDR):
- Frames dropped is between 1-3 per video playback loop. I usually see what looks like an un-reported frame drop one time per video loop. The very first time I played back the video I saw hundreds of frames drop in the first few seconds. Then playback was smooth (not including when the performance boost script runs for the first time playback at this resolution).
When my refresh rate is at 4x DSR for 4k to 1080p at 240hz with RGB 8-bit (with HDR):
- Frames dropped is between 1-2 per video playback loop. I saw maybe one un-reported frame drop one time with all the loops combined (skipping the first loop).
When my refresh rate is at 4x DSR for 4k to 1080p at 240hz with 422 10-bit (with HDR):
- Frames dropped is 0. Video player listed 1 dropped frame right at the beginning of the video. I didn't notice any un-reported frame drop one time with all the loops combined (skipping the first loop).
Overall I got the best performance using 4x DSR for 4k to 1080p at 240hz with RGB 8-bit (with HDR). Yea, I did notice a dropped from sometimes. It might have been because the 10bit video output was playing back at 10bit instead of at 8bit. The issue I had with 4k to 1080p at 240hz with 422 10-bit was that the picture looked slightly softer on the Windows desktop background. Plus the text on Windows desktop icons looked sharper at RGB 8bit vs 422 10bit.
I might start using 4x DSR for 4k to 1080p at 240hz with RGB 8-bit (with HDR) all the time. For both movie watching and for video games.
I'll still disable HDR when web browsing. Text does look a little sharper when HDR is disabled.
I am still really surprised just how sharp everything looks using 4x DSR for 4k to 1080p at 240hz vs 4k native 60hz. For some reason I still don't understand, my Benq HT4550i projector does a really good job with 4k downscaled to 1080p 240hz using DSR. It looks pretty dang close to native 4k. Sometimes the picture looks off after switching resolutions to 240hz. I'm then able to fix by trying the following, in this order: 1) Switching my AVR to another input, then back to my PC. 2) Restarting the projector. 3) Restarting my PC.
Using 1080p 240hz in 4k mode this required a modified EDID using CRU. Where I needed to remove the 4k supported listed for my projector. The NVidia control panel would then let me enable 4k DSR. Set to 0% smoothing.
My 4080 super video card can't handle playback of the Unbelievable.S01E01.2160p.HDR.Interpolation Test.mkv video because it isn't powerful enough. I can only handle playing back 4k videos which have a input resolution height of less that 1700. I setup a 2nd SVP profile to use AI model 4.22 lite when the resolution height is > 1700. Using that AI model should be easier to drive, however it didn't help much. My system doesn't have issues playing back 4k videos with a height of less than 1700, even though RTSS always reports the 100% GPU usage. GPU usage is much less for 1080p videos.