Sapphire HD4850 Bios Modded, Core upper Limit to 850Mhz in CCC!

[stingush]

looks very good, think i'll use it next week

[Factotum]

to leonarderman
what value you are looking for editing core voltage limit in bios?
1158 max voltage in bios, if it up - protection kick voltage. I want find value for protection

[jdrom]

I just figured out how to do this myself. Not overly difficult but it took CanadaRox and I a bit to figure the number conversion.

Basically you take the decimal number you want, multiply it by 100 then convert it to hexadecimal. You then invert the hex and then enter it into the BIOS using a hex editor. I use UltraEdit myself.

Example:
1000MHz = 100000
100000 = 01 86 A0 (Hex)
Invert = A0 86 01
So you'd enter in A0 86 01 to get a 1000MHz limit.

To find the limit in the BIOS, you'd have to convert the limit to "inverted" hex and then search for it.

RBE shows the limit as being correctly increased but I've yet to flash the BIOS.

I did this to my HD4850 BIOS though the same principles apply to the HD4870 as well which CanadaRox has.

EDIT: Well I got 1000/1400 limits seemingly working, however CanadaRox is having problems with his HD4870. The core limit seemed to work but the memory appears to be an issue.

[HousERaT]

Can someone with the skills put out a generic 4850 bios with high CCC limits (1200/1400) which also has a proper checksum?

[chri5g]

leonarderman did NOT do checksum
Only WHQL driver work next 8.8 beta DID NOT work

[Factotum]

I moded Sapphire HD4850 bios:
1. Upper limit GPU set to 950MHz
2. moded powerplay: in 3D set 1.158=1.21V (monitoring) - it's max value for Vgpu in bios. If value more than 1.158 - overprotection kick voltage to 1.1V in monitoring

3. fix a bios checksum. original bios
get it here
My bios work great with Catalist 8.7 in Windows XP and Vista x64, and don't work with catalist 8.8beta
Enjoy

[awdrifter]

Thank you, the card should be here tonight, I will definitely try it out.

I tried to flash the modded bios with Atiwinflash, but it gives me an error saying "VBIOS image not found" Anyone else have this problem? TIA.

[Mysterfix]

I tried to flash the modded bios with Atiwinflash, but it gives me an error saying "VBIOS image not found" Anyone else have this problem? TIA.

Try renaming the file to something shorter like 4850.rom.

[leonarderman]

leonarderman did NOT do checksum
Only WHQL driver work next 8.8 beta DID NOT work

I'm sorry! I forgot to do it! I'll it it later. Now I'm very busy.

[leonarderman]

I tried to flash the modded bios with Atiwinflash, but it gives me an error saying "VBIOS image not found" Anyone else have this problem? TIA.

Please note: I found the problem in ATI WinFlash with bios file maked by RBE1.12. Don't use ATI Winflash, please using ATIFlash 3.6 or newer (Dos)

[awdrifter]

Ok, I will give that a try, thanks.

Edit: Just noticed that ATIflash is on dos, I think I'm going to wait for ATI Tools or ATI Tray Tools to support this card, last time I flashed a bios using floppy disk it ididn't end well. Did anyone tried the renaming trick with ATIwinflash? Did that work? But then I'm at 700/1100 with CCC Overdrive and fan mod, so I'm ok for now.

w00t, post 777!

[HKPolice]

I moded Sapphire HD4850 bios:
1. Upper limit GPU set to 950MHz
2. moded powerplay: in 3D set 1.158=1.21V (monitoring) - it's max value for Vgpu in bios. If value more than 1.158 - overprotection kick voltage to 1.1V in monitoring
3. fix a bios checksum. original bios
get it here or here
My bios work great with Catalist 8.7 in Windows XP and Vista x64, and don't work with catalist 8.8beta
Enjoy

This works GREAT for my gigabyte 4850! I could only get 750mhz ATiTool stable /w Accelero S1 though

Is that normal for this voltage and high end air? It full loads at only 46C.

[Factotum]

stable /w Accelero
Is that normal for this voltage and high end air? It full loads at only 46C

Yes. I have S1+Noctua P12-1300 with voltmod 1.33V and 825MHz for GPU - full stable, max 60C

[stingush]

This works GREAT for my gigabyte 4850! I could only get 750mhz ATiTool stable /w Accelero S1 though

Is that normal for this voltage and high end air? It full loads at only 46C.

i'm also working with this bios and it works great but i get only idle 1.05V and 1.16V at load...
is there any soft-modded way to get more than that on the VGPU?

[HKPolice]

Actually after more usage, it's no longer idling at 160Mhz 2D mode, it's back to 500Mhz for some reason even when I'm not doing UVD decoding. Any idea? Driver bug or what? I'm using the newest 8.7 Cats.

[Factotum]

i'm also working with this bios and it works great but i get only idle 1.05V and 1.16V at load...
is there any soft-modded way to get more than that on the VGPU?

kick ccc.exe in Task Manager and DElit all profiles: c:\Documents and Settings\<USER>\Local Settings\Application Data\ATI\
or push "Defaults" in ATI Overdrive

[Factotum]

Actually after more usage, it's no longer idling at 160Mhz 2D mode, it's back to 500Mhz for some reason even when I'm not doing UVD decoding. Any idea? Driver bug or what? I'm using the newest 8.7 Cats.

see up, i have 160MHz in 2D

[HKPolice]

see up, i have 160MHz in 2D

Yes, I see 160Mhz after my first reboot of freshly installed drivers. But if I reboot again, it goes back to 500Mhz!!

[HKPolice]

Ok I've figured it out. If you overclock too much and VPU recovery kicks in, it changes your CCC profile so that 2D clock gets switched to the 'medium' 500Mhz setting and your 3D voltage is also LOWERED by about 0.02v.

I was at around 1.17v with this bios in 3D before, after VPU recover + 500Mhz 2D switch, it dropped down to 1.15v.

Always delete the CCC profile files after a VPU recovery!!!

Stupid ATi drivers

[drizzt5]

I'm so happy it worked

ty :P

[BAGZZlash]

RBE v1.13 is out now!

It has not many, but powerful new features.
From the changelog:

v1.13
- Added the checksum calculation method WinFlash uses because for some files, the checksums differ. See built-in-FAQ for more on this.
- Improved checksum balancing algorithm to capture this. This is a completely new method, so there might be some minor bugs, but it is guaranteed to not corrupt any file. Notify me on any strange behaviour.
- Added one-click update functionality for some 48x0 cards which corrects a well known "spin-up bug" and improves powerplay (power saving functionality).
- Added method for overdrive limit increasing. Still experimental, read built-in help text before using this. Power users only!
- Fixed bug with not properly displayed overdrive limits.

Have fun and please give me some feedback!

[Factotum]

update my bios pls
fix powerplay (THX for RBE1.13, but For all Fix use HEX by me)

[HousERaT]

I moded Sapphire HD4850 bios:
1. Upper limit GPU set to 950MHz
2. moded powerplay: in 3D set 1.158=1.21V (monitoring) - it's max value for Vgpu in bios. If value more than 1.158 - overprotection kick voltage to 1.1V in monitoring

Enjoy

Bios tested & works great, I flashed it with atiflash in windows. Now all I need is a Overdrive limit 1200/1400 version modded just like your first one.

[Mysterfix]

update my bios pls
fix powerplay (THX for RBE1.13, but For all Fix use HEX by me)

Link doesn't work.

[HousERaT]

Link doesn't work.

it just goes to the earlier post in this thread.

http://www.xtremesystems.org/forums/...6&postcount=81