Sapphire Toxic Bios Modding

[Whisky]

on wednesday i picked up a toxic 4870 and have thoroughly enjoyed messing around with it. the card runs absolutely flawlessly and never gets above 60C during gaming with the fan on 50% so im looking to get the most clockspeed i can get out of it. now i had a 1.1v bios mod on my old 8800gt that got me good results. im just wondering if there are bios mods available for this card to possibly push the clocks a bit higher than my current 775c/975m. i believe this card is the reference pcb design but im unsure of which bios i could flash it to. anybody here successfully softmodded this card or know the best way to?

[Whisky]

ive heard also that the asus bios may work on this card. it allows the max voltage up to 1.276, just a hair over the 1.263 max allowed by my stock bios. can anybody confirm if this would work?

[Whisky]

well so far i have tried the diamond and the asus bioses and bricked it both times. any input?

[ziggo0]

Can you upload your stock un-modified BIOS and i'll take a crack at it.

[Whisky]

sure thing. where should i send it to? techpowerup?

[henzo]

Or you can try to mod the bios yourself with the Radeon bios tuner RaBit. You can find it here.


http://www.mvktech.net/component/option,com_remository/Itemid,26/func,selectfolder/cat,50/page,2/

And then use this guide to do it. Hope it helps out.

http://www.tomshardware.com/forum/246888-29-guide-bios-modding-flashing

[Whisky]

well no luck with rabit. it gives me a crc error and still all of the options are greyed out

[Whisky]

well after alot of looking and reading i have come to the conclusion that there is definitively no way to softmod this card. can anybody prove me wrong?

[markolo25]

to extract the bios you have to use the new gpu-z because the old ones only extract 64k but ati put in another 64k in there so the old ones only get 64k good luck

[Whisky]

yea markolo ive been using v0.3.1, the newest. its just too damb hard to mod a non-reference bios. and the rivatuner voltmod is out of the question too

[mattgmann]

Use RBE to extract and edit your bios. Just make sure it's giving you 128k files instead of 64, or you'll brick the card and have to blind flash it. Here's a link.
http://www.techpowerup.com/rbe/

You can use ATI WinFlash to flash the bios, but it's probably more safe to do it in DOS.

Also, no, there's no way to softmod the gpu vcore on the 4870. I believe there's a way to pencil mod the voltage for the memory though. The hard mod for the gpu vcore is really easy though. All you really need is a 50ohm trim pot, a couple inches of wire, and rudimentary soldering skills. I haven't gotten any gains from just modding the bios for slightly higher voltage. With hard mods, my results have been mixed. I have one card that I can run alone @~980mhz with only a small voltage increase, and one that bombs out at ~850mhz no matter how much voltage is pumped through it.