Transaction Elimination (TE) is a key bandwidth saving feature of the ARM® Mali™ Midgard GPU architecture which allows for significant energy savings on a System on Chip (SoC) level. When performing TE, the GPU compares the current frame buffer with the previously rendered frame and performs a partial update only to the particular parts of it that have been modified, thus significantly reducing the amount of data that need to be transmitted per frame to external memory. The comparison is done on a per tile basis, using a Cyclic Redundancy Check (CRC) signature to determine if the tile has been modified. Tiles with the same CRC signature are identical; therefore eliminating them has no impact to the resulting image quality. TE can be used by every application for all frame buffer formats supported by the GPU, irrespective of the frame buffer precision requirements. TE is highly effective, even on FPS games and video. However, considering the fact that in many other popular graphics applications, such as User Interfaces and casual games, large parts of the frame buffer remain static between two consecutive frames, frame buffer bandwidth savings from TE can reach up to 99%.
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