Open GPU Documentation: This page contains register level documentation on AMD graphics processors for chip initialization, displays, and overlays. Documents for mobile chips are a superset of the desktop chip documentation; they contain all the desktop chip information as well as any relevant mobile additions. For development questions please contact: gpudriverdevsupport@amd.com R3xx 3D Registers R5xx Family 3D Programming Guide - The R5xx family provides the fastest and most advanced 2D, 3D, and multimedia graphics performance for desktop PCs in the performance mainstream markets. M56 - This document contains register information for AMD R5xx series processors (x1300, x1400, x1600, x1900 series chips). M76 - This document contains register information for AMD R6xx series processors (HD2400, HD2600, HD2900 series chips). RV630 - This document contains register information for AMD R6xx series processors (HD2400, HD2600, HD2900 series chips). This document is generally a subset of the M76 document and has been published for continuity. RS690 - This document contains register information for AMD RS6xx series processors (x1200, x1250, x1270 series chips).