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sucessful vmod rev1.1 gtx285

post #1 of 4
Thread Starter 
This is not a help needed thread but just a self congratulation being made aware of, and never have done/succeeded in a hard mod via sodering

I got the 285 early this year but could never run stock clocks; could bench no problem but tougher tests (i.e ati tool, furmark) would crash the comp so resorted to under clocking to prevent that. I knew the card core was ok as i was not artifacting. So was guessing it was voltage control and/or thermal problems on the voltage control side. While water cooled on core only temps were not a issue and unisink was doing its job.

So the past 2 days i went digging for information on my version of the card rev1.1 or 1180 as search criteria. Found a few key sentences on XS about OCP kicking in and solid screen color what i would get and HAD to turn off comp then turn back on to fix. Another piece of the puzzle could be the core is not good enough to run at stock clocks with 1.15v to core under full load.

So today i spent the better part of 8 hours printing off pictorial images of the hard mods of the card did vgpu, OCP, vgpu measure and performed them....vgpu measure point was the worst to do. No images of MY card as the macro shots i took were a bit blurry.

Source for my vgpu and vgpu measure mods http://forums.techpowerup.com/showthread.php?t=110950

on vgpu using a 10k VR 15 turn and 47ohm fixed resistor in parallel tuned to
1.22v loaded 1.10v unloaded currently
stock is 1.05v unloaded 1.15v loaded

As for the vgpu measure on the coils it shouldn't be to hard just solder to the coils and be done. Well it wasn't for me as the soder refused to stick to it; so ended up with a home made spring clip around the coil pinching/holing the bare wire to the side of the coil with a little soder securing the connection.


As for the OCP mod used the one from XS http://www.xtremesystems.org/forums/...&postcount=498
I am using a 10k VR 15 turn tuned down to 850ohms not sure if it has had much if any effect on stability but it is in place if needed and tuned to proper setting.

once i know the card is not throwing errors ill start pushing it up in clocks but for now, finally, running at stock clocks and card seems happy.
    
CPUMotherboardGraphicsRAM
SB i5 2500k gigabyte P67 GTX 480 4x2GB ddr 1600 
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CPUMotherboardGraphicsRAM
SB i5 2500k gigabyte P67 GTX 480 4x2GB ddr 1600 
Hard DriveOptical DriveOSMonitor
2x 160gb drives drives raid 0 500gb storage dvd+rw Win 7 20.1" LCD 
KeyboardPowerCaseMouse
HP PC&C 750w silencer rocket fish dynex 
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post #2 of 4
Thx for posting this. We didn't have this PCB version posted here yet.

I'd be willing to bet OCP was the main factor keeping it from running stock clocks.
    
CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
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CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
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post #3 of 4
I can confirm these mods. OCP is working great! I have done qwk boot with 1.5 gpuv on air..and run 1.38v load for DICE testing with no signs of OCP at max slider speeds in AFE.

* I have done vMEM as well, and confirmed there is NO ocp protec on vmem.. quick boot at 3.24v
post #4 of 4
All that work to run stock clocks. You my friend are a soldier. Way to not give up on the card..........Awsome job.
    
CPUMotherboardGraphicsRAM
1100T ga-990fx-ud3 gtx 4602win corsair dominator 
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OLD none windows 7 x64 Ultimate 3d projector with 98in screen MOFO 
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DUMB ocz 1000w pretty ugly logitech wireless 
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carpet gtx285 classified for physix Nvidia 3d vison  
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CPUMotherboardGraphicsRAM
1100T ga-990fx-ud3 gtx 4602win corsair dominator 
Hard DriveOptical DriveOSMonitor
OLD none windows 7 x64 Ultimate 3d projector with 98in screen MOFO 
KeyboardPowerCaseMouse
DUMB ocz 1000w pretty ugly logitech wireless 
Mouse PadOtherOther
carpet gtx285 classified for physix Nvidia 3d vison  
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