Booting up sucessfully, we went on to experiment with the voltages.
Due to the increased heat produced, the original HSF was dumped for a beefier copper HSF, the Zalman VF700Cu. We are having a promotion on it (alongside higher and lower end models) for our forummers so do check it out here.
First, we tweaked the Vgpu from 1.1V to 1.8V and saw a massive clock increase from 470MHz to 720MHz. That is a massive 80% overclock over the 400MHz original!
Again we would like to emphasise that proper cooling is ABSOLUTELY NECESSARY for running at such high a Vgpu.
Hynix's datasheet stated a maximal Vgddr2 of 2.1V, so we raised it from the original 1.8V to the 2.1V region. Playing around, the stablest Vgddr2 was between 2.00V and 2.05V. At this voltage, the memory only went an extra 5MHz (10MHz effective). That put our memory clocks at 470MHz.