Quick answer: DVI and HDMI share the same TMDS signalling, so a passive DVI-D to HDMI adapter carries video without conversion. What it cannot carry is audio, CEC or an Ethernet channel, because DVI has no pins for them. Single link DVI stops at 1920×1200 at 60 Hz, and dual link reaches 2560×1600 but only when the adapter and the source both use all 24 pins. HDMI to HDMI keeps audio and consumer control, so it is the better route whenever the source has an HDMI output.
The two connectors look like an obvious mismatch and are electrically close relatives: HDMI was developed from the same signalling scheme, which is why a two dollar passive adapter works at all. The difference is in the pins that carry everything except video, and in how much bandwidth the link was originally specified to move.
The same video, different pins
What DVI actually sends
DVI carries four TMDS pairs, one clock and three data, plus a display data channel for EDID and a hot plug detect line. That is precisely what HDMI uses for video, which is why a passive adapter needs no electronics. The remaining HDMI pins provide audio, CEC, the Ethernet and audio return channel, and a 5 V supply that a DVI port may not source at all.
Where the audio goes instead
Because DVI has no audio pins, a DVI source feeding an HDMI display gives a picture and silence. The workaround is to route audio separately, either from the source’s analogue output or through an HDMI audio embedder that merges a stereo or S/PDIF feed into the HDMI stream. If the display has no separate audio input, the embedder is the only route.
Resolution limits by link type
| Link | Payload | Practical maximum | Audio |
|---|
| DVI single link | 3.96 Gbit/s | 1920 x 1200 at 60 Hz | None |
| DVI dual link | 7.92 Gbit/s | 2560 x 1600 at 60 Hz | None |
| HDMI 1.4 | 10.2 Gbit/s | 4K30, or 1080p120 | 8 channels PCM |
| HDMI 2.0 | 18 Gbit/s | 4K60 4:4:4 | Plus bitstream |
| HDMI 2.1 | 48 Gbit/s | 4K120, 8K60 | Plus eARC |
Choosing the adapter
DVI-D, DVI-I and the four extra pins
DVI-D is digital only. DVI-I adds four analogue pins around the digital block for VGA compatibility, and a DVI-I port will feed an HDMI adapter as long as the adapter is DVI-D wired. A DVI-A plug is analogue only and will produce nothing through an HDMI adapter, which is a common source of confusion when buying second hand.
Dual link adapters are rare
Most cheap DVI to HDMI adapters are single link: they carry 12 of the 24 pins and therefore cannot reach 2560×1600. If the goal is a 30 inch 2560 x 1600 monitor, check that the adapter is explicitly dual link, and be aware that many HDMI sinks will not accept that timing anyway because it falls outside the consumer format list.
HDCP, EDID and handshake problems
A passive adapter does not touch HDCP, so a protected source still authenticates end to end. Problems appear when the adapter is a converter with its own chip: cheap ones may not support HDCP 2.2, which shows as a black screen on a 4K stream that worked at 1080p. EDID is the other trap, because a DVI port may not supply the 5 V that an HDMI sink expects on the hot plug detect line, and the source then decides no display is attached.
Where the run is long, adapters add connectors at both ends and each one costs signal margin. Convert once, at the source, and use a single cable of the right length: an HDMI extension cable joined to a short adapter is worse than one cable, and the HDMI cable rating categories guide explains where the bandwidth limits fall. If the source is a computer with DisplayPort, going through a DisplayPort 1.4 cable to an HDMI display with an active converter is usually cleaner than converting DVI.
Practical scenarios
- Old PC with DVI into a new TV: a passive DVI-D to HDMI adapter gives 1080p60 or 4K30 depending on the GPU, and audio has to come from the PC’s analogue output into the TV’s 3.5 mm jack.
- Projector with HDMI only and a DVI switcher: convert at the switcher output rather than at each source, so only one adapter is in the signal path.
- Second monitor on a docking station: if the dock exposes DVI, prefer its DisplayPort output instead, because DVI has no audio and no CEC and the adapter is one more part to fail.
- Security or signage player with DVI: check the adapter supports the exact timing; signage players often output 1366 x 768, which some HDMI sinks refuse even though 1080p works.
FAQ
Does DVI to HDMI carry sound?
No. DVI has no audio pins, so a passive adapter cannot pass sound and no firmware can add it. Audio must travel on a separate cable, or an HDMI audio embedder must merge it into the HDMI stream downstream. Adapters that claim audio support contain an embedder in the housing.
Is HDMI to HDMI better than DVI to HDMI?
When the source has HDMI, yes: it carries audio, CEC and a 5 V line, and it supports the higher bandwidth modes. DVI to HDMI is a compatibility route for older equipment, not an upgrade. Use it when that is the only output available.
Why is the picture black at 1440p over DVI?
Single link DVI runs out of bandwidth above 1920 x 1200 at 60 Hz, and the sink may also refuse that timing because it is not a standard HDMI format. Try 1920 x 1080 to confirm the cable and adapter work, then decide whether a dual link adapter or a different output is needed.
