AGP slot Inline Memory Module [AIMM]
defines a memory card that plugs into the AGP slot, on a PC mother board
with an integrated graphics core [that don't require a Video card]. The
AIMM card is use as a local memory subsystem for a graphics core
integrated in a core-logic chipset. AIMM boards augment the display
memory on motherboards that already have AGP circuits built in. An
additional 4MB [SDRAM] of dedicated video memory is possible using an
AIMM card, arranged as 1Mx32 bits. AIMM boards function in either a 3.3V
AGP slot or universal AGP card slot. AIMM modules are now referred to as
Graphics Performance Accelerator [GPA] cards.
The GPA [AIMM] memory boards only showed up on a few motherboard types.
Mother boards using Intel's 815E chip-set and integrated graphics allowed
for the GPA memory modules. Normally the GPA boards were required to
improve video performance. The on-board video chip-sets provided very
little video memory, an AIMM board increased that by 4MB. For optimum
performance an AGP card should be used in the video slot instead of an
AIMM board. I'm unsure if the AIMM memory interface ever showed up on any
AMD based mother board.
The specification defines the electrical and mechanical characteristics
of a GPA [AIMM] board. The board size and layout is provided. Slot and
module pinout is provided, as well as design notes and layout
recommendations. The recommended board is a 4 layer 60 ohm controlled
impedance, with one of the layers power, one ground and two signal
layers. The nominal board thickness is 62 mils
With the introduction of the PCI Express interface this interface is almost obsolete as more and more motherboards ship with PCIe expansion expansion slots instead of an AGP slot. Because this interface is out-dated it should not be used for new designs.
The pinout for the AIMM memory module is TBD, however the pin out relates
to AGP 3.3 volt and Universal connectors for pin names, but the pin out
is different.
The pinout for the AGP card is listed on the main AGP Bus page.
Card manufacturers are listed on the page link below, but there will be fewer and fewer as time goes on.
OEM AGP Board Manufacturers are listing on the COTS Card Manufacturer page {AGP Board Vendors, listed on this site}
The AGP interface is out dated and being replaced by the PCIe bus.
The interface listed on this
page will be found in less and less mother boards as the PCI Express
interface ships with more computers.
Engineering Key words: AGP bus, Accelerated Graphics Port Standard, AGP Pro, AGP Universal, AGP Slot, Expansion Board, Expansion Slot, Video card, Interface based on PCI bus Standard, PC Local video bus Specification, Spec, IBM Compatible Personal Computer Interface, IC, Physical Interface, PC Card Description, Obsolete, Out-Dated, Legacy, Do not use for new designs.
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