HD3870 Bios Modding (Hex Editor - Clocks - Voltages)

[ChromeGunner]

Sorry i don't get what your saying???

[jimmyz]

in the dos command -f tells the program to force the flash, if it will accept it without the -f it should indicate the checksum is correct.

[alexio]

in the dos command -f tells the program to force the flash, if it will accept it without the -f it should indicate the checksum is correct.

Yes, that's correct

[ChromeGunner]

yeah i used winflash to flash the card, but i didnt have to force it it worked....

[chrisf.uk]

""http://rapidshare.de/files/38027384/test2.rom.html

Checksum corrected, think it's ok now. Device id = HD3870 NEED TESTERS""""

that is the one i used and you said the checksum was fixed....just a heads up

Tried this one on my sapphire 3850 256mb , i had to use the -f command as it said the part number did not match , after flashing no screen output
flashed back to stock fine.

[MonsterMash]

alexio, are you able to make a volt-modded bios for the 3870 card?
I'd like to overvolt my gpu up to 1.5V, but without hardware modding...

Thank you.

Bye

[purecain]

i think thats what we all want.... i'd be soooo happy if i could read the bios file accuratly and comprehensively understand how to get the voltages above what has been found to be the maximum. 1.5v has to come in a bios and it has to come from this forum... afterall this is XS.... now come on, one of you understands the file completely... experiment for the community and make a name for yourself...
to everyone that tries and fails... thanks for trying.....

[monohouse]

I have tried to do a flash on my 3870, but it failed and I had to boot from a pci card, the reason that happened was probably because when I ran atiflash.exe without -f it says that it is "invalid PC image", but I check the size of the file it is exactly the same as the original so the bytes should not have changed, and the bios that I was editing works fine, maybe I changed too many parameters, I changed all of them, all clocks all the voltages of all the modes, maybe increasing the voltage to 1.5 was what killed it

[tarkin77]

is there any working solution for the 3870 bios volt mod problem jet? maybe someone with a gecube 3870 turbo III post his bios... from what i have read, the gecube card overclocks extremely well! maybe it has a higher vcore setting in the bios by default?

[Random Murderer]

sorry to revive an old thread, but i can't find help anywhere else. my buddy has a new visiontek 3870 with the attached bios, and his vcore is 1.4. he wants to know if it's the bios causing higher stock voltage or something hardware. i had a crack at his bios in a hex editor, but it's not laid out like mine, i think it has extra lines in it. can someone have a look at it and tell me what the voltages are in his bios?

[Riska]

Random murderer i have testet that bios and it is stock voltage 1.336volt on bootup and 1.341volt in 3d mode so his card must have some higher settings or the meassuring tool is off in its reading

[Random Murderer]

Random murderer i have testet that bios and it is stock voltage 1.336volt on bootup and 1.341volt in 3d mode so his card must have some higher settings or the meassuring tool is off in its reading

thank you. i will let him know.

[Riska]

Ok your welcome

[RealyPssd]

Random murderer i have testet that bios and it is stock voltage 1.336volt on bootup and 1.341volt in 3d mode so his card must have some higher settings or the meassuring tool is off in its reading

I've got a HIS 3870, if I flash to this BIOS I'll have 1.341v and not 1.327v?

Does the BIOS have have the fanfix, or 860MHz limit fix?

Thanks

[Random Murderer]

I've got a HIS 3870, if I flash to this BIOS I'll have 1.341v and not 1.327v?

Does the BIOS have have the fanfix, or 860MHz limit fix?

Thanks

none of that, it's just the stock bios.

[MuffinFlavored]

i think thats what we all want.... i'd be soooo happy if i could read the bios file accuratly and comprehensively understand how to get the voltages above what has been found to be the maximum. 1.5v has to come in a bios and it has to come from this forum... afterall this is XS.... now come on, one of you understands the file completely... experiment for the community and make a name for yourself...
to everyone that tries and fails... thanks for trying.....

ATI stores clocks in a certain value (something that when it comes down to megahertz, it allows decimal clocks).

To search this particular BIOS for the clocks, switch the byte order.



84 2F 01 is what is stored for the clock.
Put 01 2F 84 into Windows Calculator in scientific mode and you'll get 77700 decimal, and the core clock is, 777 Mhz.

84 2F 01
01 2F 84

Memory is stored as D8 B7 01. Reverse the byte order (D8 is a byte, B7 is a byte, 01 is a byte, which is 16 bits.) to 01 B7 D8 in Windows Calculator, and your memory is 112600, or 1126 MHz.

Voltage: 1327
1241

[Coolclocks]

IS this possibel on the 3870X2

[ante_ante]

Hey !

Can u try to mod my bios ? Don´t want that 862mhz lock and i want a stock clock around 850/1000 if it´s possible.

" Note this is the DDR3 version of HD3870 "

http://rapidshare.com/files/101674110/3870.BIN.html