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  #401  
Old 01-11-2016, 10:34 PM
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TiN TiN is offline
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You can shunt current sense DCR resistors (half value will give you 200% for OCP).
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  #402  
Old 01-13-2016, 09:57 AM
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Many thanks!
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  #403  
Old 01-29-2016, 11:23 AM
Bassplayer Bassplayer is offline
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Hey TiN,

Looking to do a reverse PLL voltage mod on my Rampage Extreme to allow less than the lowest 1.51V.

Here is the MCH area:



Any hint on what numbers you need?
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  #404  
Old 02-01-2016, 11:55 PM
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You just need replace feedback resistor with smaller value one.
I'd start with 5% to see if your voltage goes lower.
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  #405  
Old 02-14-2016, 07:46 AM
Luumi Luumi is offline
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Tin, could you quickly point me out the 5870 lightning ocp mod(s).
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  #406  
Old 02-15-2016, 09:23 AM
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VanBudd VanBudd is offline
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Hey i want to build a Zombie out of a 580 lightning.
I replaced the 3.3v and the 5v of PCIe so it worked without PCIe power.
now i cant find the Vmod Point. The Controller is a UP6225AM. The Feedback Pin didnt work on my card. Benchbros did the same Mod with UP6225AM on a 5870 lightning and it worked.

Maybe you can help me to find the Voltmod.


Last edited by VanBudd; 02-15-2016 at 09:41 AM.
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  #407  
Old 02-15-2016, 08:15 PM
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It's same, FB pin 8. Make sure you connect right points on PCB and use correct resistor (should be 4-10 times more than measued on FB pin)
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  #408  
Old 05-16-2016, 08:02 AM
matrixhaj matrixhaj is offline
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[ LIST]
Mod request #0000
[ *]Which hardware do you need to mod? GPU
[ *]Hardware model label? Gigabyte GTX 770 2GB
[ *]What do you need? more voltage (i would like to go from 1.1Vcore to 1.26,maybe even to 1.3V)
[ *]What VRM controller does your hardware run? (Label of chip or good macro shot for coded labeling) NCP4208
[ *]Describe you issues, why you need that mod? Maybe it's not worth doing?This card has almost no software voltage control. I really want to unlock this card and see what we can do with it.
[ *]What is stock voltage of VRM output / OCP/OVP trip point? I guess maximum should be 1.2V(+0.012in afterburner) on core voltage, but in reallity i can get max 1.2V on core (no change if i set +0 or +12)
[/ LIST]

imgs: Undercooler+backside with NCP4208
https://drive.google.com/file/d/0B3z...1ZMTRvTEU/view
https://drive.google.com/file/d/0B3z...w?pref=2&pli=1

Last edited by matrixhaj; 05-16-2016 at 01:41 PM. Reason: images +details
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  #409  
Old 05-17-2016, 12:08 AM
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Measure resistance to ground from pin 16 of NCP4208. You can use nearest component which this signal going to for easier probing.
Datasheet for this PWM chip is public.

Let's say for example measured resistance R is 15 kOhm. Now you can add R*5 VR trimpot from ground to this signal (15 * 5 approx 75K, so 100kOhm will do). You can slowly reduce resistance and as you go, voltage should go up.

Optionally you can play with VID mod using pins 40-47. I covered this before in voltage-mod guides here (GTX 680 classy and 980 reference if I remember correctly)
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  #410  
Old 05-17-2016, 11:16 AM
matrixhaj matrixhaj is offline
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unfortunatelly , i dont have resistance meter..
btw, iam newbie to this..
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