* Rev. 1.0: FSB 1066MHz, one system fan header, ALC883 (Vista Basic Logo)
* Rev. 1.3: FSB 1333MHz, one system fan header, ALC883
* Rev. 2.0: FSB 1066MHz, three system fan headers, ALC888 (Vista Premium Logo)
* Rev. 3.3: FSB 1333MHz, three system fan headers, ALC888
So rev. 1.3 has a slightly older audio chipset. That's seems to be about it, compared to 3.3...