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A dedicated graphics card is generally not needed for 4K video streaming for a few reasons:

1. Efficient Video Codecs
Modern video codecs like HEVC (H.265) are designed to compress 4K video efficiently, making it possible to stream high-quality video without requiring a lot of processing power. These codecs reduce the file size and bandwidth needed for streaming.

2. Hardware Acceleration
Many modern CPUs and integrated graphics (e.g., Intel UHD Graphics, AMD Ryzen APUs) come with built-in support for hardware-accelerated decoding of video formats like H.264, H.265, and VP9. This means they can handle the decoding process efficiently without needing a dedicated GPU.

3. Optimized Streaming Services
Streaming services like Netflix, YouTube, and Amazon Prime Video optimize their video streams for various devices. They use adaptive bitrate streaming to deliver the best quality video based on your internet connection and device capabilities. This optimization reduces the need for high-end hardware.

4. Dedicated Decoding Units
Modern CPUs and integrated graphics often include dedicated video decoding units that are specifically designed for handling video playback. These units offload the processing from the main CPU, enabling smooth playback of 4K video.

5. Power Efficiency
Integrated graphics are more power-efficient than dedicated GPUs. For tasks like video streaming, which don't require high computational power, integrated graphics provide a good balance between performance and power consumption.

Conclusion
- 4K video streaming relies more on efficient codecs and hardware acceleration, which modern CPUs and integrated graphics can handle well. A dedicated graphics card provides benefits for gaming and graphics-intensive tasks, but for streaming video, integrated solutions are usually sufficient.