Quick answer: DVI-I combines a digital DVI-D link with four analogue pins for VGA compatibility, so a DVI-I port can feed either a digital or an analogue display. An HDMI converter uses only the digital section: it passes TMDS video, no audio, no CEC, and it stops at 1920×1200 at 60 Hz on a single link. The analogue pins are ignored, which is why a DVI-I to HDMI adapter does nothing for a device that outputs analogue only.
The confusion around DVI-I comes from the connector shape: it accepts DVI-D and DVI-A plugs, and the four pins around the digital block are easy to overlook. Whether a converter works depends on what the source actually drives, not on which plug fits.
Three DVI variants on one shell
DVI-D, DVI-A and DVI-I
DVI-D is digital only. DVI-A is analogue only, using the four pins plus a ground cross. DVI-I carries both: the digital block plus the analogue pins, so the same port can drive a digital monitor or, through a VGA adapter, an analogue one. The connector is keyed so a DVI-D plug fits a DVI-I port but not the reverse.
Which section a converter uses
An HDMI converter is wired to the digital block, because HDMI is a TMDS link. The analogue pins are left unconnected. If the source is configured to output analogue on those pins, which happens with some KVM switches and older graphics cards, the HDMI side receives nothing and the display stays dark.
What passes through
| Signal | DVI-I | Through adapter | Note |
|---|
| Video, digital | Yes | Yes | TMDS pairs, 4 total |
| Video, analogue | Yes | No | Ignored by HDMI |
| Audio | No | No | Separate cable needed |
| CEC | No | No | Remote control lost |
| EDID | Yes | Yes | Needs 5 V from source |
Resolution and single link limits
A single DVI link carries 3.96 Gbit/s of TMDS payload, which supports 1920×1200 at 60 Hz or 1080p at 60 Hz with margin. Dual link doubles that with a second set of pairs, reaching 2560×1600, but almost no HDMI converter carries the second link because HDMI 1.x sinks rarely accept those timings. If the goal is a 30 inch 2560×1600 panel, check that the adapter is explicitly dual link and that the display accepts the timing over HDMI.
Above 1920×1200 the source may also refuse the mode because the sink’s EDID does not list it. That is an EDID problem rather than a bandwidth one, and it can sometimes be solved with a converter that stores its own EDID block.
Getting audio and a clean signal
Audio has to travel separately: the analogue output of the source into the display’s 3.5 mm input, or an HDMI audio embedder that merges a stereo or S/PDIF feed into the HDMI stream. An embedder costs more than an adapter but keeps one cable to the display.
Where the source is a computer with DisplayPort, convert there instead: the HDMI cable rating categories guide explains which cable the converted signal needs, and an HDMI audio extractor solves the audio problem at the display end. If the run is long, an HDMI extension cable joined to a short adapter is worse than a single cable of the right length.
Practical scenarios
- Old graphics card with DVI-I into a TV: the digital section works at 1080p60; route audio from the card’s analogue jack into the TV and set the TV input to the matching HDMI port.
- KVM switch that outputs analogue only: an HDMI adapter will stay dark, because the digital pins carry nothing. Use a VGA to HDMI converter with its own scaler instead.
- Second monitor on a dock: prefer the dock’s DisplayPort output; the DVI-I path loses audio and consumer control for no benefit.
- Projector with HDMI input and a DVI-I switcher: convert once at the switcher output and check the projector accepts 1920×1200 or set 1080p explicitly.
FAQ
Why is there no sound with a DVI-I to HDMI adapter?
DVI has no audio pins. The adapter only maps video pairs, so the HDMI sink receives a video-only stream. Audio must come from a separate cable or from an embedder that merges it into the HDMI signal downstream.
Does DVI-I support 4K?
No, not at any useful refresh rate. Single link stops at 1920×1200 at 60 Hz, and dual link at 2560×1600. HDMI 1.4 reaches 4K30 with a different link, but the DVI source cannot produce that timing over its TMDS pairs.
Can I plug a DVI-D monitor into a DVI-I port?
Yes. A DVI-D plug fits and uses only the digital block, which is what a digital monitor needs. The analogue pins stay unused. The reverse, a DVI-I plug into a DVI-D socket, does not fit because the socket has no holes for the four analogue pins.
