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What is the optimal resolution when using a TV as your arcade monitor?
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lanman31337:
Mine doesn't down-convert.  I'm typing on it now.  It's at 800x600, and you can definitely tell when it's 1024x768.  I can do 640x480 only in safe mode I think.  Yup, Nvidia drivers limit it to 800x600 and 1024x768.  I had to go back to svideo because vista... that's another story.  I think my component does the same thing too.
ahofle:
It absolutely does down convert when using S-video TV out.  That's why 800x600 looks blurry compared to a PC monitor.  If you are running S-Video, then you are feeding your TV a standard NTSC 480i image regardless of what resolution you have selected in Windows.  If you are lucky enough to have an EDTV with component inputs, then can you get a step up from that with 480p.

To answer the original poster, I found that 640x480 was by far the best quality image on a standard TV with S-Video.  I assume this is because it's easier for the TV out functionality of the card to convert to 480i.  That said, I used 800x600 for the Windows desktop simply because 640x480 was too big (as mentioned here already), but I ran all emulators at 640x480 for optimal picture quality.
Bluedeath:
720x480 (NTSC) and 720x576 (PAL) are the theoretical best values because thay match (more or less) the TV CRT resolution.
Chunce DeLeone:
I run 720x486 on the Component input,  What am i losing vs 640x480?  Is the image quality less?  Also when I go for the lower rezolutions I can't get the screen to fill, there are black borders, 
fjl:
I use 1024x768 also on component. Fills the screen as long as I don't use certain effects.
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