9800XT Vdd mod

[MrCrusher]

CATCH,
Do you have pics/info on the Vref and Vddq mods???????
I been looking for a while and have not found any info.
I am stuck at 400 no matter what the Vdd (2.8-3.3volts)

[Hobocrow]

Originally posted by 2PiZzA
Can anybody tell me, is there VRef mod on 9800XT? Just wondered because of voltage controller the same as for vdd is near to the voltage controller of vdd itself. If you understand what i mean.

Bump, because this is a very important question, imo... I think others have done this mod....please share!

[CATCH22ATPLAY]

Just pencil in a random resistor ther bud.

[MrCrusher]

Random Resistor?????? Which resistor and where??

[CATCH22ATPLAY]

Crap now my mem is screwed again. From 451 down to 432. Hell even default 365 was messed up for a bit. I'll have to redo mods and see what actually does work. Gonna have to check all my capacitors and see if any are burned out. Vmods didn't do this. I screwed up the ddr months ago O/Cing. I was amazed when i managed to get the stuff to 451 after messing up the ddr. Now back to the drawing board. Hmm perhaps i should take better notes.

[tomati]

Hi everybody ,

I just got my 9800 pro 128mo from sapphire with r360 , hynix 2.8 , xt pcb and heatsink of the pro 256mo , my gpu voltage is 1.55v and keep 407mhz with atitool , my mem voltage is 2.48v and keep 371mhz with atitool , i found a pencil trick for gpu voltmod and I wonder if it's exist one (pencil trick , don't be an expert in soldering) for the mem voltmod, any help will be appreciated, thanks ,tomati

[tomati]

Hi,

I made some test ; I put 1.75v (pencil trick) on the gpu and got 420mhz with atitool , when I started the mem (staying the gpu @ 420mhz ) I got only 353mhz (ram voltage is now @ 2.45v , don't know where I lost the 0.03v) but when I put the gpu @ 378mhz , I hit 378 for the mem ( best then first time with 2.48v ??? , so strange) , so I wonder if it's a problem with the heatsink (stock one) , because when I try the gpu @ 420mhz , the ram was hot (I can stay my finger on) and when I try the ram @ 378 mhzit was less hot but the gpu refuse to increase and stay @ 378mhz.


then 420mhz(1.75v)/353mhz(2.45v)

378mhz(1.75v)/378mhz(2.45v)

so I'm still looking for a pencil trick for the ram , because I can't put mds grabber on it (no place) and I don't want to solder for the rma in case ; I wonder if the R2 (73A) is the good one to pencil because is the one to decrease , I will try and give you my feel back , see you later , tomati

[tomati]

Hi,

So it's the good one resistor "73A" , I got 2.65v now but didn't seems to help , need better aircooling for my gpu and ramsink , maybe it will help , little disapoint because i got only 403mhz for the gpu @ stock voltage (1.56v) and 345mhz for thez ram @ 2.65v , don't understand !!! , yesterday with 2.45v I got 353mhz when the gpu was @ 420mhz with 1.75v , need more test, see you , tomati


edit: just retry @ stock voltage 407mhz@1.56v and 365mhz@2.44v , then I suspect the aircooling to be responsible of the bad performance when I increase the voltage gpu & ram

[tomati]

hi,

I do the pencil trick , put 1.66v on the gpu , din't touch the ram , put an artic vga silencer and poor ramheatsink, flash the card with the xt sapphire bios and now I hit the 440/380 , then it was well an overheating issue , so I guess that I can go over because I'm only at 60°c max in burn under atitool .