Difference Between DVI and AGP

DVI (Digital Visual Interface) and AGP (Accelerated Graphics Port) are two types of computer graphics interfaces. DVI is a video interface that connects a display to a video source, whereas AGP is a graphics card interface that delivers faster data transfer rates than PCI.

Read this article to find out more about DVI and AGP and how they are different from each other.

What is DVI?

DVI stands for digital video interface, and it is used to connect a computer display to a video source such as a graphics card. It can generate high-quality video without signal degradation because it supports digital transmissions. Depending on the connector used, DVI can support both analogue and digital signals. DVI connectors are classified into three types: DVI-D (digital only), DVI-A (analogue only), and DVI-I (integrated, supports both analogue and digital signals).

DVI-I (integrated) supports both analogue and digital signals, making it suitable for both older VGA monitors and newer digital displays. DVI-D (digital) exclusively accepts digital signals, making it perfect for usage with modern monitors that do not accept analogue signals. DVI-A (analogue) only allows analogue signals, making it suitable for older VGA monitors.

DVI has the advantage of providing a digital transmission, which removes the quality loss that can occur with analogue signals. It also supports high resolutions and quick refresh rates, making it perfect for high-performance graphics in gaming and professional applications.

What is AGP?

AGP is a specific interface that connects the graphics card to the system memory at fast speeds. This allows the graphics card to access data more rapidly and effectively than it could through a general-purpose interface such as PCI. AGP also has a dedicated bus for data transfer between the graphics card and the CPU, reducing bus traffic and improving overall system performance.

One of the primary advantages of AGP is that it allows the graphics card to access system memory without going through the CPU. This is known as "sideband addressing," and it allows the graphics card to access system memory more rapidly and effectively than a general-purpose connector would. AGP also provides hardware acceleration of 3D graphics and video playback, which can enhance speed in these applications even more.

AGP has been mainly superseded by newer graphics card interfaces, such as PCI Express (PCIe), which provide greater bandwidth and more advanced functionality. AGP is still used in certain older systems, especially those targeted for gaming and other graphics-intensive applications.

Difference between DVI and AGP

The following table highlights the major differences between DVI and AGP −




Full Form

Digital Visual Interface (DVI)

Accelerated Graphics Port (AGP)


Video Standard

Expansion Slot


It is used to transmit digital video signals.

It has a dedicated pathway for graphics cards and system memory.

Supported Signals

Digital and analogue



2560x1600 at 60 Hz

2.1 GB/s (AGP 8x)

Connection Type

connects displays and video cards.

Connects mainboards with video cards.

Primary Use

High-quality digital video transmission

Graphics-intensive applications such as gaming and 3D modelling


In conclusion, DVI and AGP are two different computer graphics technologies. DVI is a digital interface that transmits video signals from a computer to a display device, whereas AGP is an expansion slot that connects a graphics card to a computer motherboard.

DVI has a higher picture quality than analogue connections like VGA, whereas AGP was meant to deliver faster and more efficient communication between the graphics card and the system's CPU. Both protocols have been mostly replaced by newer, more modern technologies such as HDMI and PCIe.

Updated on: 26-Apr-2023


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