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Gtx 285 volt modding help

post #1 of 47
Thread Starter 
just read this guide

http://www.techpowerup.com/forums/sh...d.php?t=110950

however i dont have availability to a potentiometer so i can only use resisters

would it be the same if i soldered the 19 pin to one of the 6 pin pins?

if so, how many ohms am i looking at for roughly a 1.25vcore?
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post #2 of 47
In the article you linked the author mentions that the variable resistor was at about 10 ohms for 1.25Vcore. YMMV though.
I've never used fixed resistors, I like to be able to turn the voltage back closer to stock when the benching is done.
Is your card revision 2 like the one in the link? The rev.1 voltmod was different, the 285s I've modded were rev.1.
    
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post #3 of 47
dont do the GPUv mod.. frankly unless your freezing the GPU you wont need it. Only OCP is required for clocking on air or water.. and OCP is easy as shorting a resistor.

*just saying because the few i have played with all reacted the same- clocking to ~830-850mhz on water with no voltage increases. Only cold would bring faster clocks.
post #4 of 47
Thread Starter 
Quote:
Originally Posted by CL3P20 View Post
dont do the GPUv mod.. frankly unless your freezing the GPU you wont need it. Only OCP is required for clocking on air or water.. and OCP is easy as shorting a resistor.

*just saying because the few i have played with all reacted the same- clocking to ~830-850mhz on water with no voltage increases. Only cold would bring faster clocks.
i only get 76c during gaming. that isnt that high and im not planning on getting a water loop.
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post #5 of 47
Thread Starter 
Quote:
Originally Posted by FtW 420 View Post
In the article you linked the author mentions that the variable resistor was at about 10 ohms for 1.25Vcore. YMMV though.
I've never used fixed resistors, I like to be able to turn the voltage back closer to stock when the benching is done.
Is your card revision 2 like the one in the link? The rev.1 voltmod was different, the 285s I've modded were rev.1.
my pcb is the 2nd revision. its more difficult to do so thats why im asking for help.

when will ovp kick in? do i have to do ovp mod for 1.25vgpu?

he mentions that the final resistance was around 10ohms but i dont understand why he needed to use a 1k VR with turns 100ohms each. can i get an explanation?
Edited by tyuo9980 - 1/22/11 at 5:56pm
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post #6 of 47
Quote:
Originally Posted by tyuo9980 View Post
i only get 76c during gaming. that isnt that high and im not planning on getting a water loop.
If the card is on air you don't really want to voltmod it, I was assuming that you were on water. Temperature makes as much difference as voltage, adding a bit too much voltage might even make your card clock worse when you ask about a fixed voltage increase.

Quote:
Originally Posted by tyuo9980 View Post
my pcb is the 2nd revision. its more difficult to do so thats why im asking for help.

when will ovp kick in? do i have to do ovp mod for 1.25vgpu?

he mentions that the final resistance was around 10ohms but i dont understand why he needed to use a 1k VR with turns 100ohms each. can i get an explanation?
You should be able to clock the card higher just with the ocp mod & better cooling, save the vgpu mod for last, you want better cooling first anyway.

The voltage can be manipulated with resistance, a variable resistor or potentiometer lets you decrease & increase the R allowing more or less voltage to pass. Voltage has a sweet spot for the card with different variables, & it is good to be able to change the voltage & find it.
    
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post #7 of 47
Quote:
Originally Posted by FtW 420 View Post
If the card is on air you don't really want to voltmod it, I was assuming that you were on water. Temperature makes as much difference as voltage, adding a bit too much voltage might even make your card clock worse when you ask about a fixed voltage increase.



You should be able to clock the card higher just with the ocp mod & better cooling, save the vgpu mod for last, you want better cooling first anyway.

The voltage can be manipulated with resistance, a variable resistor or potentiometer lets you decrease & increase the R allowing more or less voltage to pass. Voltage has a sweet spot for the card with different variables, & it is good to be able to change the voltage & find it.
This^^ Good advice! Where is your rep button FTW?
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post #8 of 47
The OP came to me asking for some advise on doing the vgpu mod for his card http://www.overclock.net/general-vol...ml#post9768782 from this topic im sure....been exchanging pms through the evening been giving advise on how to do it and choosing the right FIXED resistor but i have serious doubt even if he has the tools he will toast the card and/or trigger OCP at post.
    
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post #9 of 47
Thread Starter 
Quote:
Originally Posted by FtW 420 View Post
If the card is on air you don't really want to voltmod it, I was assuming that you were on water. Temperature makes as much difference as voltage, adding a bit too much voltage might even make your card clock worse when you ask about a fixed voltage increase.



You should be able to clock the card higher just with the ocp mod & better cooling, save the vgpu mod for last, you want better cooling first anyway.

The voltage can be manipulated with resistance, a variable resistor or potentiometer lets you decrease & increase the R allowing more or less voltage to pass. Voltage has a sweet spot for the card with different variables, & it is good to be able to change the voltage & find it.
thanks for the info. im planning on doing a fan mod and im expecting ~15c drop.

i actually need this voltage bump. i got a bum card and it isnt stable at stock speeds. and now bfg is outa business so i cant rma it.

how would the ocp mod give me higher clocks?
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post #10 of 47
Thread Starter 
Quote:
Originally Posted by systemaxd View Post
The OP came to me asking for some advise on doing the vgpu mod for his card http://www.overclock.net/general-vol...ml#post9768782 from this topic im sure....been exchanging pms through the evening been giving advise on how to do it and choosing the right FIXED resistor but i have serious doubt even if he has the tools he will toast the card and/or trigger OCP at post.
i might start with a 5-10ohm resister to test and then ill slowly up the resistance for around 1.25v
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