AGP
The accelerated graphics port is present only in very few
new motherboards; it is being phased out. This was a slot dedicated to enhance
the graphics capabilities of the system by allowing a high-speed direct bus to
the RAM, unlike PCI, the other prevalent bus. (a bus refers to a channel that
is used to transfer data. ) it operated at 66 MHz and had a 32-bit width. The AGP
specification have passed through three
revisions (AGP1, 2, and 3).the original AGP specification, now referred to as
AGP 1, specified only 1X and 2X speeds. It also mandated an AGP slot that
provided 3.3 v. AGP2 extended support to
the 4X mode of operation. It also specified an AGP slot that provided 1.5 v, but AGP2 cards of
both versions to run in it. AGP3 supported speeds up to 8X and would only work
in slots that operated at 1.5 v.
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| AGP Slots |
The AGP slots differed in the construction, so that 3.3 v
and 1.5v slots and cards were not compatible: the 3.3v AGP slot has a partition
towards the left, while the 1.5v slot has a partition towards the right. Each of
these slots also had a pro version that extended the slot a bit to the right.
The AGP pro slot was for those cards that needed additional power
(which was supplied by the pro extension). The cards were also
similarly-notched. Maximum data transfer speeds offered were:
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