The trick was to drop the refresh rate to 119.85 Hz. There appears to be a small amount of overhead not accounted for by the calculator. This theoretically fits exactly within the data rate of DP 1.4, however I found that I was still getting DSC and the alt tab bug in this mode. It has DP 1.4 and HDMI 2.1 (24 gbps limited), so I am best served using DP 1.4 which gives me a bitrate of 32.40 gbps (data rate 25.92 gbps) to play with.ģ840 × 2160 x 120 Hz x RGB x 8 bpc x CVT-R2 requires 25.82 gbps data rate. In my case, I am using a Gigabyte AORUS FO48U. Use this to calculate the data rate of a given display mode:ĬVT-R2 aka CVT-RBv2 - Uses about 2% less bandwidth. RGB is recommended.ĭropping the color depth from 10 to 8 bpc is usually fine, as 10 bpc only used in HDR or color managed apps, and the GPU will employ 8 bpc + dithering, which produces a result almost as good as 10 bpc. YCbCr422 chroma subsampling) is not recommended, as it looks terrible in desktop use and games. To reduce the data rate, you can either lower the refresh rate, color depth, or color format. Users with full bandwidth (48 gbps) HDMI 2.1 will likely not encounter DSC unless using 4K 160+ Hz and/or 12 bpc. Check manufacturer specs.ĭata rate is actual throughput after overhead, just multiply bitrate by 0.8.įor example, 3840 x 2160 (4K) x 120 Hz x RGB x 10 bpc has a data rate 32.27 gbps and if used over DP1.4a, will exceed the data rate of 25.92 gbps, and will therefore need to be compressed using DSC. If you have the option, you can try switching to a higher bandwidth interface.īitrate 32.40 gbps (Data rate 25.92 gbps)īitrate 24 - 48 gbps (Data rate 21.33 - 42.67 gbps) Until nVidia fixes this, the only way to avoid the alt-tabbing bug is to avoid DSC altogether by using a display mode that fits within the data rate of the interface.
DSC is used when the data rate of the video signal exceeds that of the interface.
If you've noticed that you get a 1 - 10s black screen when alt-tabbing full screen games where you otherwise shouldn't (same desktop resolution/refresh), it is due to using Display Stream Compression (DSC) on nVidia GPUs.
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