Hello all,
I want to overclock my 4890 further and to do that i need to tweak the voltage on the video card to achieve a stable overclock. Right now i have bios files which i want to load onto my video card's bios. Can someone show me a safe way to flash it and be able to restore if it fails in some way. Thank you

Hello xibeleli,hopefully our Tech's or our hardware guru members will address your question soon as possible........thanks for your patience

I'm sure you've already checked, but what cooler are you running? I have an HD4890 aswell, OC to 920/1025 stock voltages, I would like to raise them too! I'm using stock cooling and my temps get in like the 80's under load which is a red flag to me, and if you are going to be raising voltages they will increase a bit. I will be moving to water cooling soon so I can push the card harder. Just checking to see if you've checked your load temps.
** EDIT **
Well, I just did a google search for you and I think I found a program that can do it.. It sets the clocks on mine, and it reports that it has properly adjusted the voltages for me too! nifty!

http://www.techpowerup.com/downloads/1383/mirrors.php

have fun with it(; hope it works for you like it did for me!

...and watch those temps...

Andrew