Types and Slot VGA

VGA Card ISA (Industry Standard Architecture) 

That is, the slot is used as a mounting card (circuit card). ISA slot is black, has a transfer speed at 8 bits / sec. 

VGA Card PCI (Peripheral Part Interconnect) 

is the bus that is designed to handle some hardware. PCI bus standard was developed by a consortium of the PCI Special Interest Group formed by the Intel Corporation and several other companies, in 1992. Purpose of the establishment of this bus is to replace the bus ISA / EISA historicallyin the past used in the IBM PC or kompatibelnya. White Slot is used as a place for PCI card installation. PCI knowledge menstransfer capability of 32-64 bits / sec faster than the ISA. 

AGP Card 

AGP bus, stands for Accelerated Graphics Port is a dedicated bus as the bus support high-performance graphics card, replacing the ISA bus, the VESA bus or PCI bus historicallyin the past used. 

AGP specification was first (1.0) made by Intel in the Intel 440 chipset series in July 1996.AGP is actually made based on the PCI bus, but it has some better capabilities.In addition, physically, logically and electronically, AGP is independent of the PCI.Unlike the PCI bus in a system there can be several slots, in a system, there should only one AGP slot only.


AGP 1.0 specification to work with the speed of 66 MHz (AGP 1x) or 133 MHz (AGP 2x), 32-bit, and use a 3.3 Volt signaling.AGP version 2.0 was released in May 1998 to add the speed up to 266 MHz (AGP 4x), and a lower voltage, 1.5 volts.The last version of AGP is AGP 3.0 which is generally referred to as AGP 8x which was released in November 2000.This specification defines the speed of up to 533 MHz allowing the theoretical throughput of up to 2133 Megabytes / second (two times higher than that of AGP 4x).Nevertheless, the fact that the performance demonstrated by the AGP 8x is not actually twice as high compared to AGP 4x, due to some technical reasons.


In addition to the above four AGP specification, there is another specification called the AGP AGP Pro.Version 1.0 of the AGP Pro was introduced in August 1998 and revised in version 1.1a in April 1999.AGP Pro has a slot that is longer than a regular AGP slot, with the additional power that can be supported, ie up to 110 Watt, 25 Watt larger than usual AGP is only 85 Watt.If the power can be seen from being supplied, clearly seen that the AGP Pro can be used to support high-performance graphics cards are intended for workstation graphics, ATI FireGL or NVIDIA sort Quadro.However, AGP AGP Pro is not compatible with ordinary: ordinary 4x AGP graphics card can indeed be inserted into the AGP Pro slot, but not vice versa.In addition, because the AGP Pro slot is longer, AGP graphics card AGP 1x or 2x can not really get into the slot so that it can damage it.To avoid damage from this, many motherboard vendors to add retention at the end of the slot: If you want to use AGP Pro graphics card is loose retention.

In addition to the better video performance, the reason why Intel designed the AGP is to permit the graphics card can access physical memory directly, which can improve performance significantly, with the integration costs are comparatively lower. Permit the use of AGP graphics cards that directly access the process RAM, so the on-board graphics cards can directly use the physical memory, without having to add more memory chips, although it must be coupled with reduced memory for the operating process. 

PCI Express x16 

Beginning in 2006, AGP has begun to be shifted by the card-based PCI Express x16 graphics, which can transfer knowledge up to 4000 Mbyte / sec, which is times faster than AGP 8x, needs much less power (only 800 mV voltage only. )