Hi guys,
was playing around with my old visiontek hd 4850's and as you know they had a pretty crappy bios that let the card idle up to 69c. Definitely needed a better bios and had one but ever since the newer CCC 8.12 and up the high voltage custom bios' didn't work. Actually anything above 1.158v won't work.
Additionally with the stock cooler any fan speeds above 40% would get pretty loud which is undesirable for idle and surfing.
MSI created a bios with enhanced powerplay low clocks of 160/500 during non 2d/3d use (idle/surfing) to save a couple of watts and reduce heat as well.
So I created a custom standard hd 4850 bios (not for gainward/palit/etc) that works fine for the regular run of the mill visiontek, msi, ati, etc. cards with the following perks based on the MSI hd 4850 bios:
1) 700/1100 clocks (upper limit of stability with stock cooler and 1.158v limit)
2) 160/500 clocks for idle
3) 1.158v limit for CCC 8.12-9.2 compatibility
4) fan profile to have card idle in the 50's quietly (less than 40%) and ramp up to the 70's under load.
I tested this bios under a couple of loops of 3dmark06 and Vantage with my visiontek card and it seemed to work just fine.
So for run of the mill hd 4850's with stock coolers, I present you a nice custom bios. Please feel free to try and comment. Flash at your own risk.
http://www.mediafire.com/?lnonjowmnjx
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