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At AGP 1× speed, this may be sent as a single byte and a following 16-bit side-band request started one cycle later. At AGP 2× and higher speeds, all side-band requests, including this NOP, are 16 bits long. Sideband address bytes are sent at the same rate as data transfers, up to 8× the 66 MHz basic bus clock.
The graphics address remapping table (GART), [1] also known as the graphics aperture remapping table, [2] or graphics translation table (GTT), [3] is an I/O memory management unit (IOMMU) used by Accelerated Graphics Port (AGP) and PCI Express (PCIe) graphics cards.
AGP 2× Mode (max aperture size 32 or 64 MB) UDMA/33; Supported RAM types: SDRAM (PC66 and PC100, PC133 with overclocking) up to 4 DIMMs of 256 MB; Supported CPUs: Pentium II with 66 and 100 MHz FSB; Pentium III with 100 MHz FSB (133 with overclocking) Celeron (Covington, Mendocino, Coppermine) Allowed up to two CPUs for SMP
Some motherboards feature a "Memory Hole at 15 Megabytes" option required for certain VGA video cards that require exclusive access to one particular megabyte for video memory. Later video cards using the AGP (PCI memory space) bus can have 256 MB memory with 1 GB aperture size.
In computing, an aperture is a portion of physical address space (i.e. physical memory) that is associated with a particular peripheral device or a memory unit. Apertures may reach external devices such as ROM or RAM chips, or internal memory on the CPU itself.
A mainboard with Intel i740 Intel I740 4MB AGP complete in box A Intel740 PCI video card from Real3D. The Intel740, or i740 (codenamed Auburn), is a 350 nm graphics processing unit using an AGP interface released by Intel on February 12, 1998. [1]
3 does classic MacOS or Mac OS X support GART on PowerPC Macs with AGP-Interface?
Camera lenses often include an adjustable diaphragm, which changes the size of the aperture stop and thus the entrance pupil size. This allows the user to vary the f-number as needed. The entrance pupil diameter is not necessarily equal to the aperture stop diameter, because of the magnifying effect of lens elements in front of the aperture.