This Bios editor does work but it has a bug. I tried it with the original bios (067) from my Sapphire 3850 and changed the speeds and selected the 1.327 voltage from the drop-down box, saved and used winflash but winflash didnt recognise the file as a bios rom file. Problem was the values in drop-down boxes have a , instead of a . - so manually type in the voltages and it works just fine. No longer need to use Rivatuner!

This editor only allows tweaking of speeds and voltages *NOT* fan speed but I popped a Zalman VF900 on my card too get around that. Now I have a very quiet, very cool card with a decent overclock. I also use the "driver and CP" bundles from NGOHQ so no RAM hungry CCC or third party programs needed.