PC graphics question…

Why do I get a better picture when connecting an analog display (Dell E173FP 17″ flat panel) to a DVI port using a DVI-to-VGA adapter than I do when connecting the monitor directly to the VGA analog port on the video card? Signal separation and shielding?

This has happened on two different cards – a GeForce FX5200 from Chaintech and a GeForce 6200 from PNY.

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