You can check if the MSI bios actually does anything to your card simply by:
Install the MSI bios (or what ever you want to test). Max out powertarget, voltage and whatnots, push a moderate OC you know to be stable. Run kombustor or something heavy. Check from HWiNFO or any other tool that shows your GPU powerdraw. If it is around the number your bios should let you; fine. If not, your bios is not working and defaulting to default power limit.
Happens to me with MSI Trio bios, it 'works' but cannot get the card to draw more then default numbers of power. I have palit gaming pro OC or something, the reference board with an A-chip. Best bios i've found working properly is the Galax 380w one, with it everything works as expected including getting my powerdraw to 380w.