MSI ATX Motherboard G52-MA00362 - Manual (Page 59)

Chapter 3
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AGP Aperture Size (MB)
This item allows you to select the size of the Accelerated Graphics Port
(AGP) aperture. Aperture is a portion of the PCI memory address range
dedicated for graphics memory address space. Host cycles that hit the
aperture range are forwarded to the AGP without any translation. Avail-
able options are [4], [8], [16], [32], [64], [128], and [256]. Default value is
[64].