Well, a lot of people didn't like that my other Morrowind comparison was using MGSO, so here's a vanilla one. Of course I made use of my PC and turned all the Morrowind settings as high as they'd go. Here's a rundown of each version:
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PC:
Source - 1600x1200
8x SSAA (Nvidia control panel)
16 anisotropic filtering (Nvidia control panel)
High quality texture filtering (Nvidia control panel)
In-game sliders maxed
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Xbox:
Source - 640x480
Progressive scan
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All the footage was recorded without compression. I didn't want to render it in 1080p because the PC footage was 1600x1200. If you convert that resolution into 16:9, it ends up being 2133x1200, a resolution Vegas won't render and Youtube won't recognize. So, I chose to render in 1440p with a 50Mbps bit rate to reduce quality loss.
One factor that is hard to convey over the video is the smoothness at which each game plays. The Xbox can't maintain 30 fps, while modern PC's have no problem running the game at frame rates upwards of 4x the Xbox's. This isn't a knock on the Xbox, as it was a relatively powerful machine for its time and cost.
My 970 supports DSR (rendering the game at higher resolutions than your display supports, then downsampling the image to your monitor's resolution), but Morrowind just doesn't make use of this. If you use MGXE, DSR works without any problems, but the vanilla game doesn't seem to like it. I tried the game's launcher and regedit, the game just wasn't having it. That's it. If you've read this far, you have the longest attention span on Youtube, congratulations.