The same VGA cable can be used with a variety of supported VGA resolutions, ranging from 640x400px @70 Hz (24 MHz of signal bandwidth) to 1280x1024px @85 Hz (160 MHz) and up to 2048x1536px @85 Hz (388 MHz). There are no standards defining the quality required for each resolution, but higher-quality cables typically contain coaxial wiring and insulation which make them thicker. A quality cable should not suffer from signal crosstalk (ghosting), which occurs when the signals in one wire induce unwanted currents in adjacent wires, and other signal degradation effects; shorter VGA cables are are less likely to introduce significant degradation. Some higher-end monitors and video cards featured separate BNC connectors for RGBHV signal, allowing highest quality connection using five 75 Ohm coaxial cables.
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