How Many Pins Are on a Dual-Link DVI-D Connector?
A dual-link DVI-D connector features 25 total pin locations: a primary grid of 24 digital data pins arranged in three rows of eight, plus a single horizontal flat ground pin located off to the side. Unlike other DVI variations, a DVI-D interface is purely digital, meaning it completely omits the four analog pins typically clustered around the flat ground bar. This dual-link configuration doubles the transmission bandwidth compared to single-link DVI, enabling video output at higher resolutions and refresh rates.
The Pin Layout and Physical Structure
The connector face of a dual-link DVI-D plug or port is divided into two distinct sections: the digital pin grid and the analog ground blade slot.
- Digital Grid (24 Pins): The connector contains three horizontal rows, each holding eight pins (8 × 3 grid). All 24 pin slots are occupied by physical contact pins.
- Ground Blade (1 Flat Pin): Situated to one side of the digital grid is a single, wide, flat pin (often designated as pin C5). In a DVI-D connector, this blade provides ground shielding.
- Absence of Analog Pins: In DVI-I (integrated) and DVI-A (analog) connectors, four round pins surround the flat blade to carry red, green, blue, and horizontal sync signals. In a DVI-D connector, these four pin positions are entirely absent, leaving a flat, solid plastic surround.
Dual-Link vs. Single-Link DVI-D
The primary physical distinction between single-link and dual-link DVI-D lies within the central columns of the 24-pin digital grid.
A single-link DVI-D connector features two 3 × 3 pin clusters separated by a blank middle section of six missing pins, giving it 18 active digital pins alongside the ground blade (19 total pins). The dual-link version populates that central gap, providing all 24 digital pins to activate a second Transition-Minimized Differential Signaling (TMDS) transmitter.
| Connector Type | Active Digital Pins | Analog Pins | Flat Ground Blade | Total Pins Present |
|---|---|---|---|---|
| DVI-D Single-Link | 18 | 0 | 1 | 19 |
| DVI-D Dual-Link | 24 | 0 | 1 | 25 |
| DVI-I Single-Link | 18 | 4 | 1 | 23 |
| DVI-I Dual-Link | 24 | 4 | 1 | 29 |
Bandwidth and Resolution Capabilities
The extra six data pins on a dual-link DVI-D connector allow the hardware to run two TMDS links simultaneously. While single-link DVI operates at a maximum pixel clock frequency of 165 MHz—capping output at 1920 × 1200 at 60 Hz—a dual-link connection bypasses this limitation.
With all 24 digital pins utilized, dual-link DVI-D supports resolutions up to 2560 × 1600 at 60 Hz, or 1920 × 1080 at 144 Hz, making it a reliable legacy standard for high-resolution displays and early high-refresh-rate gaming monitors.