I've used both the 030 bios and 032. My card came with the 030 bios. My experience of both as follows:
Installing this bios and setting the power limit to +20, the card would throttle. Only around 60% gpu usage
Power limit set to +20, the card did not throttle and would always perform at 90-100%.
Power limit set to 0% on both these bios', the card did not throttle, always performed at 90-100%
If you're still experience throttling I recommend setting Unofficial overclocking mode
to without Powerplay support
My Afterburner config may be of use to you, I have attached it. Replace the CFG in the Afterburner root directory.
I recommend MSI Afterburner 3.0.0 Beta 7 as it supports voltage control for tahiti cards.
MSIAfterburner.zip 1k .zip file
030 bios.zip 105k .zip file
For a stable 1200/1500 overclock, I need to set my voltage to 1.231V
I also recommend using Afterburners 3D/2D profile management, as pictured below.