How to Modify Your HD2900 BIOS Clock Frequencies by Hex File

[mossad]

FF01 seems to be a 'proxy' - pointing somewhere els in the bios-file to the 3d voltage. FF01 is safe to overwrite with the HEX value corresponding to the desired voltage.
How to do this is described earlier in this thread. (remeber to invert the hex numbers!)

i just tried to mod my 2d, so now i am on 399/405 instead of 507/513 but i tried to modify voltages too, so my lines now seem this: DC 9B 00 34 9E 00 84 03
399 / 405 / 900 (0.9V) but rivatuner is stil reading 1V, first i tried 0.95 then i thinked its too small to be seen but either 0.9v isnt working, so can be voltages regulated at other place ?
i just not tested 3d voltages yet...

edit: i unpluged 2 ground cables from 8pin so now its only 6pin conected, so there isnt active overdrive in CCC, so now 0.9V for 2d normally works which is good... so there had to be only 6pin in 8pin cause other hand it seems that if overdrive is active CCC is controling voltages and 3d speeds more than bios...