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Upscaling 1080p content to 4K could definitely give you a better image, but the Intel iGPUs don't have enough power to do it with high-quality upscaling. If you are outputting primarily 1080p sources at 1080p, I'm not sure it would be worth the hassle of setting up an external player. The image could be subjectively better, but not considerably better unless you add things like debanding and image sharpening. Again, I don't know if it would be worth the trouble if the gain was minimal. I can't say I can recommend using an external player with madVR given your usage.

OK then, thank you so much for answering Warner306. I'm definitely not planning on buying a new GPU soon so I'll just keep it my HTPC as is, especially since the new version of Kodi (v18) should be released sometime this year (I think) and it will probably have some improvements.