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Gtx 285 volt modding help - Page 2

post #11 of 47
OCP mod provides higher clocks due to the card getting more current, and the voltage supply becoming more stable under demands. OCP can exist on stock voltage with air cooling due to the temps your getting = increases in amperage through the voltage supply circuit.

heat = resistance increases = additional amperage = OCP
post #12 of 47
Thread Starter 
Quote:
Originally Posted by CL3P20;12108311 
OCP mod provides higher clocks due to the card getting more current, and the voltage supply becoming more stable under demands. OCP can exist on stock voltage with air cooling due to the temps your getting = increases in amperage through the voltage supply circuit.

heat = resistance increases = additional amperage = OCP

will the additional current fry my card? and how much of a temp rise would you think there will be.

i cant find a ocp mod for the rev2 card. bummer.
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post #13 of 47
    
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post #14 of 47
Thread Starter 
Quote:
Originally Posted by FtW 420;12114100 
Is this card the same as yours for the ocp mod?

http://www.xtremesystems.org/forums/showpost.php?p=4008694&postcount=87

thanks. this is the one.

will using a 1k resistor damage my card? and how much rise in temps will i be expecting?

one more thing. i dont hav an ultra thin soldering iron. how would i manage to solder it onto that tiny pin?
Edited by tyuo9980 - 1/23/11 at 1:59pm
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post #15 of 47
Thread Starter 
i have a general understanding on how to volt mod these cards now. but the only trouble im having is knowing how much resistance i need.

I CAN ONLY USE FIXED RESISTORS.

1. how much resistance for ocp mod?
2. how much resistance for vgpu mod? (~1.25v)

2d8rzfm.jpg
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post #16 of 47
What resistances do you measure at those points and what should they be after the mod?

You can calculate the total resistance of 2 resistors in parallel like this:
Rtotal = R1*R2 / (R1+R2)
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post #17 of 47
Quote:
Originally Posted by tyuo9980;12153272 

I CAN ONLY USE FIXED RESISTORS.

This is what Tha D0ctor did when he was using fixed resistors.
P1020004.jpg

You will really need to play with different size resistors to see what you'll want.

What is the stock resistance between mod point and ground? Start with ~15-20 times that resistance, as your fixed resistor.
    
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post #18 of 47
Quote:
Originally Posted by tyuo9980;12153272 
i have a general understanding on how to volt mod these cards now. but the only trouble im having is knowing how much resistance i need.

I CAN ONLY USE FIXED RESISTORS.

1. how much resistance for ocp mod?
2. how much resistance for vgpu mod? (~1.25v)

2d8rzfm.jpg

i can post the stock and modd'd resistances for you. Lemme get the gpu out and get back to you..i have these mods done and the gpu is sitting...just very busy with work today..
post #19 of 47
Thread Starter 
Quote:
Originally Posted by CL3P20;12162002 
i can post the stock and modd'd resistances for you. Lemme get the gpu out and get back to you..i have these mods done and the gpu is sitting...just very busy with work today..

thanks! u help a ton. only if i can rep u like 100 times
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post #20 of 47
in reference to the pic-

red= GPUv : i have 10.1ohms with GPUv at ~1.3v
green= OCP : i have 1.5ohms and have confirmed OCP is disabled with 1.7v GPUv

*stock is going to vary depending on your BIOS and stock voltages.
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