The difference in price seems to be reliability. I've had problems before with the cheaper modems, dropouts & slow speeds. I suppose that if you are lucky you may find a cheap modem that does just a good of a job as a more expensive one. The difference between ISA and PCI isn't much. There is no difference in speed as the communication speed between both ISA and PCI slots and the modem card is well above the speed of the phone line. PCI modems are all plug and play whereas the not all the ISA ones are.

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