HDMI / DP Bandwidth

Pick resolution, frame rate, bit depth and chroma subsampling and I compute the required bandwidth (Gbps), comparing it against HDMI 1.4/2.0/2.1 and DisplayPort 1.4/2.1.

redzilla.cl — hdmi-bw

Required bandwidth

—

Gbps of video data

Pixel clock

—

total pixels × fps

Bits per pixel

—

chroma × depth

Gbps —

Minimum —

Which standard supports it?

Standard	Data capacity	Margin	Supported?

Usable data capacity per standard (channel coding already removed).

How I compute it · assumptions

1. I use the standard CEA timing totals (with blanking): 1080p→2200×1125, 4K→4400×2250, 1440p→2720×1481, 720p→1650×750. The pixel clock = totals × fps.

2. The bits per pixel come from chroma and depth: 4:4:4 = 3×bpc, 4:2:2 = 2×bpc, 4:2:0 = 1.5×bpc, with bpc = 8, 10 or 12.

3. The data bandwidth = pixel clock × bits per pixel. It is compared against the effective data capacity: HDMI 1.4 = 8.16 · HDMI 2.0 = 14.4 · HDMI 2.1 = 42.6 · DP 1.4 (HBR3) = 25.9 · DP 2.1 (UHBR20) = 77.4 Gbps.

4. These are standard totals: with Reduced Blanking (common on DisplayPort) or DSC compression the bandwidth over the cable can be noticeably lower.

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