For higher resolutions, the data needed to form a single screen image can be large, system also needs data for operations such as memory refresh, keyboard, mouse handling, drive access etc., this results in video data bottlenecks to avoid this Video accelerator is used.
Incorporate processing power onto video board (rather than CPU) for graphics data processing.
A graphics accelerator application specific chip (ASIC) that intercepts graphics tasks and processes them without the intervention of system CPU.
Core of the accelerator is the graphics chip which connects directly to PC expansion bus.
Graphics instructions and data are translated into pixel data and stored in video RAM.
VRAM offers second data bus that is routed directly to RAMDAC (Random Access Memory Video to Analog Converter).
Graphics chip directs RAMDAC operation and ensures that VRAM data is available.
RAMDAC translates video data into R, G, and B video signals along with vertical and horizontal signals.
Output signals generated by the RAMDAC drive the monitor.
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