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PNY 9800GT 1GB voltmod

post #1 of 11
Thread Starter 
I bought one of these on sale over the holidays. I modded the bios from 1.05v to 1.1v but that just was not enough.

I couldn't find any voltmods for this board but I found a 9600gt voltmod using the same voltage regulator and went from there.

vgpu measurement points are the green dots below. With the 1.1v bios mod I was seeing 1.18v on my multimeter. Sorry for the crappy pics but I think this is enough.





The voltage regulator is an APW7088. The green dots below are connected to the FB pin (red dot).



50kohms to ground gives me 1.28v - a 0.1v increase. So use a 100k VR or a 50k VR plus a 25k resistor. I used a mystery meat 50k one-turn VR since I like to live on the edge. 1.35v gave me 790 core when I was stuck around 730-740 earlier.

I found the vmem measure points (the two caps below the other measure points) as well as the voltage regulator... that one is next.

Oh and I'm not new at this at all but haven't tinkered around with PCs for a couple years. I used to go by the name shortcircuit on the xtremesystems forums
Edited by Jays05 - 1/13/09 at 6:16pm
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 9950 125W ASUS M3A79-T Deluxe PNY Geforce 9800GT 1.38v/2.2v 815/2050/1066 4GB Corsair Dominator PC8500 
Hard DriveOSPowerCase
1TB Western Digital SATA Windows 7 Beta Silverstone 1000W PSU Lian Li PC-76 
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1TB Western Digital SATA Windows 7 Beta Silverstone 1000W PSU Lian Li PC-76 
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post #2 of 11
Nice job. Very good clocks!

Welcome to OCN!
    
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E4400@3.5 24/7 1.4v Gigabyte UD3P 8800 GTS 512 Corsair xms2 1:1 389 DDR2 4-4-4-12 2.0v 
Hard DriveOptical DriveOSMonitor
WD 1Tb black SAMSUNG DL DVD Burner SATA Windows Xp Samsung syncmaster 204b & dell 17' 
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post #3 of 11
Nice VR you have there But it's risky, you need a trimmer. One time I've set on a while 1,95V on GF6600 but card survived From this time I use trimmers
post #4 of 11
i guess the earlier cores scaled better with voltage
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Amd Ryzen 5 1600x broken Evga GTX 1060 SSC Corsair Vengeance LPX 
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Thermaltake 1350 
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post #5 of 11
Thread Starter 
I got the vmem volt mod working! And in case a reverse volt mod is needed there, I see how to do it. Pics are incoming but I wanna see what 2.05-2.1v does first
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 9950 125W ASUS M3A79-T Deluxe PNY Geforce 9800GT 1.38v/2.2v 815/2050/1066 4GB Corsair Dominator PC8500 
Hard DriveOSPowerCase
1TB Western Digital SATA Windows 7 Beta Silverstone 1000W PSU Lian Li PC-76 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 9950 125W ASUS M3A79-T Deluxe PNY Geforce 9800GT 1.38v/2.2v 815/2050/1066 4GB Corsair Dominator PC8500 
Hard DriveOSPowerCase
1TB Western Digital SATA Windows 7 Beta Silverstone 1000W PSU Lian Li PC-76 
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post #6 of 11
Thread Starter 
The red dots below are the vmem measure points.



And here is the vmem volt mod.



It's an APW7067N.

The red dot is the FB pin. Is is connected to a variety of nearby spots but I used the location with the green dot. I was measuring 2.0v on my multimeter before the volt mod.

35k ohms to ground = 2.048v
25k ohms to ground = 2.062v
10k ohms to ground = 2.130v

So a 50k VR will work

The resistor that I used as a solder point... I think that one can be replaced by a VR for a reverse vmod.
Edited by Jays05 - 1/13/09 at 6:17pm
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 9950 125W ASUS M3A79-T Deluxe PNY Geforce 9800GT 1.38v/2.2v 815/2050/1066 4GB Corsair Dominator PC8500 
Hard DriveOSPowerCase
1TB Western Digital SATA Windows 7 Beta Silverstone 1000W PSU Lian Li PC-76 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 9950 125W ASUS M3A79-T Deluxe PNY Geforce 9800GT 1.38v/2.2v 815/2050/1066 4GB Corsair Dominator PC8500 
Hard DriveOSPowerCase
1TB Western Digital SATA Windows 7 Beta Silverstone 1000W PSU Lian Li PC-76 
  hide details  
Reply
post #7 of 11
Thread Starter 
I updated all the pics above.


Can anybody help me defeat OVP so I can go above ~1.38v? From what I've read, I need to mess with the VID pins to raise the base voltage. Is this as simple as VID grounded = 1 and VID not grounded = 0 ?

I'm at 815/2050/1066 now
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 9950 125W ASUS M3A79-T Deluxe PNY Geforce 9800GT 1.38v/2.2v 815/2050/1066 4GB Corsair Dominator PC8500 
Hard DriveOSPowerCase
1TB Western Digital SATA Windows 7 Beta Silverstone 1000W PSU Lian Li PC-76 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom 9950 125W ASUS M3A79-T Deluxe PNY Geforce 9800GT 1.38v/2.2v 815/2050/1066 4GB Corsair Dominator PC8500 
Hard DriveOSPowerCase
1TB Western Digital SATA Windows 7 Beta Silverstone 1000W PSU Lian Li PC-76 
  hide details  
Reply
post #8 of 11
would this work on my XFX 9800gt ??
    
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60GB 
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CPUMotherboardGraphicsRAM
t7300 hp intel onboard 2GB 
Hard Drive
60GB 
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post #9 of 11
where do I look to study the finer details of this trade? I've been scouring for a while and have been mainly overwhelmed. My ultimate goal is to have a better understanding of what a system is based on assessment of the components. I would like to extend this understanding to many fields, so I think I'm really looking for a computer or circuit engineering class or something, but I'm broke.
post #10 of 11
Quote:
Originally Posted by Jays05 View Post

I bought one of these on sale over the holidays. I modded the bios from 1.05v to 1.1v but that just was not enough.


I couldn't find any voltmods for this board but I found a 9600gt voltmod using the same voltage regulator and went from there.


vgpu measurement points are the green dots below. With the 1.1v bios mod I was seeing 1.18v on my multimeter. Sorry for the crappy pics but I think this is enough.







The voltage regulator is an APW7088. The green dots below are connected to the FB pin (red dot).





50kohms to ground gives me 1.28v - a 0.1v increase. So use a 100k VR or a 50k VR plus a 25k resistor. I used a mystery meat 50k one-turn VR since I like to live on the edge. 1.35v gave me 790 core when I was stuck around 730-740 earlier.


I found the vmem measure points (the two caps below the other measure points) as well as the voltage regulator... that one is next.


Oh and I'm not new at this at all but haven't tinkered around with PCs for a couple years. I used to go by the name shortcircuit on the xtremesystems forums



hello, i have a friend with a problem with 9800gt, want know a value of diode 14, you know?? thank you very much
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