📽️ ProjectorDB

HDMI bandwidth calculator

01020304050Gbps on the wireHDMI 2.0 (TMDS)18 Gbps · 8b/10bExceedsneeds 22.3HDMI 2.1 FRL 40G40 Gbps · 16b/18bFitsneeds 20.0HDMI 2.1 FRL 48G48 Gbps · 16b/18bFitsneeds 20.0

4K at 60 Hz, 10-bit 4:4:4 needs a 594.0 MHz pixel clock and 17.82 Gbps of video data, which is 22.28 Gbps on a TMDS link or about 20.05 Gbps on an FRL link. HDMI 2.0 (TMDS) (18 Gbps) cannot carry it; HDMI 2.1 FRL 40G (40 Gbps) carries it; HDMI 2.1 FRL 48G (48 Gbps) carries it.

Required rate counts blanking, using CTA-861 total raster sizes. For FRL this is a conservative estimate: real FRL packs blanking more efficiently, so results close to a limit can go either way. DSC compression is not modelled. Fractional rates (59.94 Hz) need 0.1% less.

Resolution
Refresh (Hz)
Bit depth
Chroma
Pixel clock
594.0 MHz4400 × 2250 total raster
Video data
17.82 Gbps30 bits/pixel
TMDS line rate
22.28 Gbps743 MHz TMDS clock
FRL line rate (est.)
20.05 Gbpsvideo × 18/16
Show the numbers
Total raster4400 × 2250 px
Pixel clock594.00 MHz
Bits per pixel on the wire30
Video data rate17.82 Gbps
TMDS line rate (×10/8 via clock)22.28 Gbps
FRL line rate estimate (×18/16)20.05 Gbps
HDMI 2.0 (TMDS)18 Gbps raw · 14.40 Gbps payload
HDMI 2.1 FRL 40G40 Gbps raw · 35.56 Gbps payload
HDMI 2.1 FRL 48G48 Gbps raw · 42.67 Gbps payload
4K at 60 Hz, 10-bit 4:4:4 needs a 594.0 MHz pixel clock and 17.82 Gbps of video data, which is 22.28 Gbps on a TMDS link or about 20.05 Gbps on an FRL link. HDMI 2.0 (TMDS) (18 Gbps) cannot carry it; HDMI 2.1 FRL 40G (40 Gbps) carries it; HDMI 2.1 FRL 48G (48 Gbps) carries it.