Advanced Graphics Riser
Encyclopedia
The Advanced Graphics Riser is a variation of the AGP port used in some PCIe motherboards made by MSI
Micro-Star International
Micro-Star International Co., Ltd is a Taiwan-based electronics company and one of the world's largest motherboard and video card manufacturers.-Overview:MSI is one of the top three motherboard and video card manufacturers worldwide...

to offer a limited backwards compatibility with AGP. It is, effectively, a modified PCIe slot allowing for performance comparable to an AGP 4x/8x slot , but with limited support of AGP cards. The manufacturer has published a non-exhaustive compatibility list of cards and chipsets that work with the modified slot.
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