display - What maximal resolution is reasonable when using a VGA cable?

I own a laptop which only has VGA as a port for external displays. I'm thinking to buy an external flat-screen monitor for my laptop. Which resolution should the display have at the utmost so that I still have a reasonably sharp image?

Answer

I am not sure there is a limit in the standard.

However:

Your graphical card needs to be able to provide the image. 400MHz DACs are common, which would commonly limit it to any configuration using a lower than 400MHz bandwidth. E.g. 2048x1536@85 Hz (388 MHz). If your DAC is more capable then you can go higher, e.g. to 7680x4800.

You monitor needs to be able to recognize the signal.

With a poor quality cable and high bandwidth signals ghosting is likely. Which can be solved by simply buying a good enough cable.

In your case the GMA 4500 limits you to 2560x1600.

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