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DVI-I, having the capacity to carry both digital and analog signals, can be used to connect an analog output to an analog input, or a digital output to a digital input only. Take note that a DVI-I cable cannot connect a digital output to an analog input or vice versa. A DVI-I plug will accept any type of DVI cable, DVI-I, DVI-D, or DVI-A, but you must make sure that your source and display are both using the same format for it to work. A dual link DVI-I cable, on the other hand, will handle up to 330 MHz and is backwards compatible with single link. Thus if you are unsure which type you need, the dual link will work where the single link may not. In order to determine your required bandwidth just multiply your desired resolution by your desired refresh rate (ie. 1600x1200 x 70 = 134 MHz).
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