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Overclock.net - Overclocking.net > Volt Mods > General Volt Mods > Graphics Cards Volt Mods | |
PNY 9800GT 1GB voltmod
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01-09-09
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#1 (permalink) | |||||||||
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Commodore 64
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PNY 9800GT 1GB voltmod
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 
Last edited by Jays05 : 01-13-09 at 09:16 PM Reason: updated pics |
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01-09-09
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Overclocker
 
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Nice job. Very good clocks!
Welcome to OCN!
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E4400 @ 3.6 1600FSB on 650i Board  Quote:
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01-11-09
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Extreme Cooler
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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 
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E6420 @ 4629.82MHz Celeron D347 @ 7360.14MHz Ballistix PC8500 @ 1400MHz CPU pots http://www.overclock.net/dry-ice-liq...ew-series.html
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01-11-09
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#4 (permalink) |
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goad ting i r dislekxic
 
Join Date: Feb 2007
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i guess the earlier cores scaled better with voltage
__________________
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01-11-09
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#5 (permalink) | |||||||||
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Commodore 64
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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
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01-11-09
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#6 (permalink) | |||||||||
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Commodore 64
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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.
Last edited by Jays05 : 01-13-09 at 09:17 PM Reason: updated pics |
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01-14-09
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#7 (permalink) | |||||||||
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Commodore 64
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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
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01-23-09
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Overclocker
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would this work on my XFX 9800gt ??
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