Difference Between AGP and PCI

A Graphics card in a computer or laptop is hardware that enhances the quality of the video memory, and the display of the screen is also changed to high-definition. The capacity and the power of any computer or laptop are upgraded with the type of graphic card used in it. It also allows it to perform high-level tasks on the computer. There are two different types of graphic cards that are the – integrated graphic card and the discrete graphic card.

AGP vs PCI

The main difference between AGP and PCI is that AGP allows the computer to generate multiple requests while transferring any data and it does not allow to share bandwidth with different devices while comparatively, on the other hand, the PCI graphic card doesn’t generate such requests and the data to be transferred is a longer process also the bandwidth of the PCI share with different devices.

AGP and PCI

AGP is the abbreviation used for the Accelerated Graphic Port. As the name says, AGP is placed in the computer or a laptop as a port and is small in size and can be identified by its identical color that is brown. The hardware feature was introduced in the year 1996 and has a bandwidth of around 533 Mb/s.

PCI is the abbreviation used for the Peripheral Component Interface. This hardware comes in the form of a bus and is present in a comparatively larger size than of AGP port and is in white. The technology is completely based on the VL-bus and ISA technology. And it was introduced in the year 1992 and standardized by PCI Special Interest Group.

Comparison Table Between AGP and PCI

Parameters of ComparisonAGPPCI
DefinitionHardware developed with high-speed direct point channels for 3D accelerators and video cards.Hardware completely based on the ISA and VL-bus technology.
Abbreviation Accelerated Graphic PortPeripheral Component Interconnect
Introduced In 19961992
PurposeUsed alongside the graphic cardI/O interface bus
Priority QueuesMaybe high/lowAbsent
3D Graphics qualityHighLow
RequestsPipelinedNon-pipelined
Peripheral DeviceHighLow
Address/DataDe-MultiplexedMultiplexed
SlotsShortLong
TargetSingleMultiple
Peak at 32 bits533 Mb/s133 Mb/s

What is AGP?

AGP is the abbreviation used for the term Accelerated Graphic Port and was introduced in the year 1996 by the company Intel. It can be defined or stated as the hardware which can directly point channels and has the high speed for 3D accelerators and video cards. The sole purpose of the hardware was to work alongside the graphic card.

The unique feature possessed by the AGP hardware is the DIME (Direct Memory Access) which means the hardware can directly access the computer’s main memory and perform the complex texture mapping process. The bandwidth of the hardware is quite high and is approximately 533 Mb/s.

The size of the slot is comparatively shorter and only one in number also, the color of the AGP slot is brown. The transactions length for the AGP is 8 bytes, while for boundaries, it is also 8 bytes. And the priority queues are absent in the technology.

What is PCI?

PCI is the abbreviation used for the Peripheral Component Interconnect, and the technology was introduced back in the year 1992 and got its standardization by PCI Special Interest Group. The complete technology used for building the technology was ISA and VL-bus technology. The sole purpose of the technology was to generalize the Input/Output interface bus.

The bandwidth of the PCI technology is comparatively shorter and approximately 133 Mb/s. Also, it lacks the feature DIME and generates a single request for data transfer, while the next request is not generated until the first is completed.

The size of the slot of the PCI is comparatively larger and is multiple. The color of these slots is white. The transactions length for the PCI is 4 bytes, while for boundaries, it is 4 bytes.

Main Differences Between AGP and PCI

  1. AGP can be stated as the hardware having channels and high speed for the 3D accelerator and video cards while comparatively, on the other hand, the PCI can be stated as the technology that is built on keeping ISA and VL-bus in mind. 
  2. AGP is the abbreviation used for the term Accelerated Graphic Port whereas comparatively, on the other hand, the PCI is the abbreviation used for the term Peripheral Component Interconnect. 
  3. The hardware system AGP was introduced in the year 1996 while comparatively, on the other hand, the technology system PCI was introduced in the year 1992.
  4. The main aim of the AGP is to work alongside graphic cards while comparatively, on the other hand, the main aim of PCI is the Input/Output interface bus.
  5. The priority queue for the AGP may be high or low, while comparatively, on the other hand, the priority queue for the PCI is absent. 
  6. The quality of the 3D graphics for the AGP is quite high, while comparatively, on the other hand, the quality of the 3D graphics for PCI is low.
  7. The AGP generates a single pipeline request while comparatively, on the other hand, the PCI generates multiple non-pipeline requests. 
  8. The peripheral device configuration through AGP is more while comparatively, on the other hand, the peripheral device configuration through PCI is less.
  9. The data of AGP is considered to be de-multiplexed, while comparatively, on the other hand, the data of PCI is considered to be multiplexed only. 
  10. The size of the slots is short in the case of AGP and is brown, while comparatively, on the other hand, the size of the slots is large in the case of PCI and is white.
  11. The AGP has a specific single target while comparatively, on the other hand, the PCI has multiple specific targets.
  12. The bandwidth of AGP is around 533 Mb/s, while on the other hand, the bandwidth of the PCI is approximately around 133 Mb/s.

Conclusion

To summarize the given topic, it can be concluded that with the time computer has been upgraded with new features and technologies. And thus, graphic cards are among one of them. They are designed to enhance the display and video of the screen up to high-definition (HD). Even they are of two different types – integrated and discrete. The integrated ones are pre-installed in the computers, while the discrete ones are installed through the external procedure.

AGP and PCI both are separate hardware belonging to the same field. Where AGP is a single port, PCI is an interface bus, the interface of both hardware is different. The port for AGP is small and is brown, while PCI is an interface bus and has a large size slot with white.

References

  1. https://www.mindshare.com/files/resources/MindShare_Intro_to_PCIe.pdf
  2. https://www.elibrary.ru/ip_restricted.asp?rpage=https%3A%2F%2Fwww%2Eelibrary%2Eru%2Fitem%2Easp%3Fid%3D3173970
  3. https://ieeexplore.ieee.org/abstract/document/915139
  4. https://www.elibrary.ru/ip_restricted.asp?rpage=https%3A%2F%2Fwww%2Eelibrary%2Eru%2Fitem%2Easp%3Fid%3D8443826
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