In short, why does the the TV doesn’t need a fan to cooldown and PC requires one while dealing with high definition videos?
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Professional editing software actually uses the CPU more unless you are using GPU accelerated special effects.
GPUs are good at things like floating point calculations that are like rough math that the cpu struggles with. Cpu likes integers or something. It’s mostly done to like draw shadows and 3d models in games where the computer is producing every little detail it needs to offload a bunch of very very easy math problems that the cpu is inherently kind of bad at. Floating points are simple decimals, not exact. So 1/3 is .3 in floating point logic. That’s bad for encoding video files but great for casting shadows and scattering light naturally. Tho yes a modern gaming gpu meant for alot of floating point math in your games or whatever is going to do its job of putting stuff on your screen fine.
Rendering pre recorded clips and audio into a file are actually what a cpu is really good at. A gpu is not meant for precise calculations. Having a dedicated GPU is not going to improve performance on things that are easily handled by integrated graphics, even if they are handled by the dedicated GPU instead of your integrated gfx in cpu.
The only computer with like a powerful GPU are exclusively for gaming or very niche work. Not even all photo or video work needs a powerful GPU. They seem to be used just as much for other things too like mining BTC.
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