I don´t know if that is recommendable to flash a board with a firmware addressed for a different rev. board. If it was exchangable, I am sure Gigabyte would have uploaded the firmware for rev. 2.0 as well as for 1.0 so it might be risky..
There is someone in this topic that has a rev. 2.0 board and he still has the noises so still no improvement on that, maybe that holy new firmware that might come out soon for rev. 1.0