Always check the motherboard manual before making a cable for onboard serial ports because different pinout conventions exist. Your gigabyte board uses 'AT Everest' convention which has 1-1 mapping between IDC pin numbers and DB9 pin numbers.
A quick way of checking is to test with a multimeter to see whether IDC pin 5 or pin 9 is grounded. It will be one or the other, and that tells you which convention to use.
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