G73 bios questions(7600gs ddr3)

I got a new Palit 7600gs Sonic(450/1000@540/1480).And want to tweak its bios.Firstly I set up "nibitor" to edit the bios and read something about it.There is a variable called "Geometric delta clock" which has the most effect on overclocking.It is 0 by def but I read that changing its value to negative makes a space to go 40-50mhz further for gpu(http://xtreview.com/review114.htm).I think its like a o/c lock by the manufacturer depending on the gpu.Anyway,as the article says we should enter a negative value to overcome this limit.But it rejects to enter negative delta values.
http://img147.imageshack.us/img147/3631/nibitorhx8.jpg

Secondly;there is a timings setup tab.
http://img100.imageshack.us/img100/2142/nibitor1ll1.jpg
changing these values has no effecet on o/c potential but "tRcdRD from 12 on 7, tRcdWR with 8 on 2, tRRD with 8 on 2" result a ~3fps increase at the same mhz speeds.

Finally;I wonder that I can use the voltage setting effectively.It has only one choice in bios and I measure 1.15v for gpu on the pcb.
http://img245.imageshack.us/img245/4042/nibitor0ic6.jpg

What are your opinions on these?do u have any other tricks?I have coolmod & vmod experinces on two other vga cards before but this will be my first to mod a vga bios "manually" :)

I'm trying to do the same on my asus 7600gt's. I'm also having problems with the Geometric delta clock's

http://www.xbitlabs.com/articles/vid...s-voltmod.html
they are using Nvidia BIOS Modifier

i changed delta to -100 which refers "256-delta".this means you should enter 156 in order to set delta to -100.then you can increase the clock a bit more.e.g: 540->595 for me :)

by the way i'm running at around 800/815(1630) now with the help of zalman vf900 & custom ramsinks & vmodding :)

Nice what scores are u getting? I'm only running 640/725 on stock cooling without mods :|

my score with def cooling was 540/740 and 665/740 with bios mod and a little vmod(1.25v) :) default voltage for gt gpu is 1.35v where 1.15v for gs.but they are the same gpu by all means :) my score around 1.35v with no biosmod was around 660/740.

after cooling and other mods,i reached up to 815mhz on gpu with some artifacts(795hmz artifact-free) but temp was around 75C.then decreased the voltage a little bit(1.55v @ 60C) and now i'm running @770/815 for long term safety.ramsinks are custom made by me :)
http://img74.imageshack.us/img74/4628/7600gs005eh8.jpg
3dmark03 score is around 15500 and 3dmark05 is around 7500 on my default system bed.