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Is was those crappy winmodems that caused all the problems. They cheaped out on hardware, so you basically got a sound card. All of the work had to be done by the driver, which also put a lot of load on your CPU. Serial modems just worked since everything was done in hardware.
By the late 90’s most monitors were smart enough to detect when sync speed was too far off and not try to display an image.
It was the old monitors that only supported a single or fixed set of scan rates that you had to worry about damaging. Some could be very picky and others were more tolerant.