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Gtx 285 volt modding help - Page 3

post #21 of 47
Thread Starter 
ok i guess at load the voltage goes to 1.15 as reported in gpuz.

these are the resistors i will be getting.

http://www.thesource.ca/estore/product.aspx?language=en-CA&catalog=Online&category=Resistors&product=2719018

would starting with the 8.2ohm resistor for the vgpu mod and 1.5ohm resistor for ocp mod be a good choice?
Edited by tyuo9980 - 1/27/11 at 5:41pm
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post #22 of 47
Thread Starter 
any easy ways of soldering the points?
in the picture the ocp mod seems quite easy. however the small pin is just too small! do i have to solder just that top point of the pin? or can i just solder directly onto the whole pin or would that short out the pin?

24oqfk6.jpg
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post #23 of 47
Quote:
Originally Posted by tyuo9980;12179259 
any easy ways of soldering the points?
in the picture the ocp mod seems quite easy. however the small pin is just too small! do i have to solder just that top point of the pin? or can i just solder directly onto the whole pin or would that short out the pin?

24oqfk6.jpg

They would have to be soldered to the point the lines go to, soldering to the negatives on the pcie connectors won't be hard, but the OCP has to be that spot without bridging anything. Same for the vgpu, that is a capacitor & you just want to solder to the one end without shorting it.
    
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post #24 of 47
Thread Starter 
Quote:
Originally Posted by FtW 420;12180972 
They would have to be soldered to the point the lines go to, soldering to the negatives on the pcie connectors won't be hard, but the OCP has to be that spot without bridging anything. Same for the vgpu, that is a capacitor & you just want to solder to the one end without shorting it.

this might seem like a stupid question, but how would i short out the component? would it be caused by some soldier being in contact with both positive and negative ends of the resistor?

one more quick question. would using a higher resistance resistor for the ocp make any difference?

lets say 10ohms instead of 1.5ohms
Edited by tyuo9980 - 1/28/11 at 7:17pm
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post #25 of 47
short = 0 ohms... so you must bridge the connection to a ground

For OCP on the 285's and 470's - performing OCP mod will raise the effective GPUv under load by ~.2v .. so if you now idle at stock of ~1.1v ..you will load at ~1.3v after you mod for OCP.

^^^This is partially why I explained earlier that the GPUv mod is not neccessary for these GPU's unless you freeze them. You will not gain clocks from more voltage if you cannot cool these GPU's better. All of the cards I have tested ran the same clocks on air/water regardless of voltage. It was only until frozen where voltage would help to scale clock speeds.
post #26 of 47
Thread Starter 
Quote:
Originally Posted by CL3P20;12186595 
short = 0 ohms... so you must bridge the connection to a ground

For OCP on the 285's and 470's - performing OCP mod will raise the effective GPUv under load by ~.2v .. so if you now idle at stock of ~1.1v ..you will load at ~1.3v after you mod for OCP.

^^^This is partially why I explained earlier that the GPUv mod is not neccessary for these GPU's unless you freeze them. You will not gain clocks from more voltage if you cannot cool these GPU's better. All of the cards I have tested ran the same clocks on air/water regardless of voltage. It was only until frozen where voltage would help to scale clock speeds.

very useful info thanks.

ive seen on another forum that they used a 1k fixed resistor for ocp. theres a 998.5ohm differnce between 1k and 1.5... so im sorta confused on which one to use. can any1 clear that up for me thanks.
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post #27 of 47
can use either for OCP mod.. the final resistance isnt that important for air cooling. So long as you are lowering it you will see more stable clocks.
post #28 of 47
Thread Starter 
thanks for all ur help, but just to get things straight...

for ocp mod i can use any resistance i want, and it will all do the same thing with same results? so theres no downside in using 1k resistor as opposed to 100ohm or 50ohm, 10ohm, etc?
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post #29 of 47
nononono.. thats not what I meant.
Quote:
1k fixed resistor for ocp. theres a 998.5ohm differnce between 1k and 1.5k

What I meant was any of the above values should suit your needs.
post #30 of 47
Thread Starter 
Quote:
Originally Posted by CL3P20;12199357 
nononono.. thats not what I meant.


What I meant was any of the above values should suit your needs.

would i get more performance gain with a 1k over a 10ohm?

and what would the downsides be? thats what im asking
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