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I need to process live streaming (video and audio), and I am looking for a really great performance PC. I plan to buy a video capture card, but I wonder if additional video card makes andy difference.

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The GPU on the video card could be used to compress the audio and video for transmission if the capture card doesn't have a dedicated processor for this.

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Certain capture cards, if used in combination with a video/graphics acceleration card (aka graphics card to you and me), will significantly improve performance. It will enable to you to save a great deal of money by making a less powerful standard x86/amd64 processor acceptable.

This excerpt describes an example of a product (8-in composite video capture card) that benefits from a (Direct3D compatibly) dedicated video card:

Using the card with other Datapath products: The VisionRGB-E1/E1S captures the data and stores it in an on-board video buffer. This data is then copied using DMA to the host system for display, storage or streaming. When a Datapath graphics card is used, the VisionRGB-E1/E1S transfers the data directly to the graphics card thereby increasing performance. The VisionRGB-E1/E1S sends the relevant portions of each captured image to each display channel and instructs each channel to use its graphics engine to render the data. This fully utilises the hardware and dramatically increases performance. When a Direct3D compatible graphics card is used the data can be transferred direct to the graphics card in a similar manner to the Datapath graphics card with the added benefit of non-tearing captures. When the data is displayed on a non Datapath graphics card, the VisionRGB-E1/E1S sends the data to system memory or direct to the graphics card, dependant on the software used for display.

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