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post #31 of 42 (permalink) Old 05-06-2010, 02:57 PM
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Not every single resistor on the card. Just one resistor for each pin. The method is just as risky as the assumptions you made when you penciled your suspected mod points.

I think you should duct a leaf blower onto your air cooler...wait till liek 2am and fire it up for some hardcore OC action ..really piss of the neighbors.. and see if you can F5 your CPU-Z before the cops show up!!
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post #32 of 42 (permalink) Old 05-07-2010, 12:29 AM
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You think repeatedly soldering round a chip is less risky than laying down some high resistance carbon?

O you who turn the wheel and look to windward, Consider Phlebas, who was once handsome and tall as you. T.S.Elliot, 'The Waste Land', IV

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post #33 of 42 (permalink) Old 05-07-2010, 10:50 AM
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Quote:
Originally Posted by Meaker View Post
You think repeatedly soldering round a chip is less risky than laying down some high resistance carbon?


I'm talking about doing the same thing you've been doing. Using your pencil to shade one resistor connected to pin at a time. Slowly working your way around the IC, ruling out pins as you go. I never said any thing about solder. I said to 'continue' meaning what you are already doing, shading...

I think you should duct a leaf blower onto your air cooler...wait till liek 2am and fire it up for some hardcore OC action ..really piss of the neighbors.. and see if you can F5 your CPU-Z before the cops show up!!
~CL3P20

Do the opposite of what this guy just said if you want the best results you can get
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post #34 of 42 (permalink) Old 05-07-2010, 11:35 AM
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Shading resistors directly probably wont help (though I tried some likely candidates), you have to find a direct connection to ground, non of the connections to ground worked.

O you who turn the wheel and look to windward, Consider Phlebas, who was once handsome and tall as you. T.S.Elliot, 'The Waste Land', IV

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post #35 of 42 (permalink) Old 05-07-2010, 11:40 AM
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For each resistor, one side will be ground.

I think you should duct a leaf blower onto your air cooler...wait till liek 2am and fire it up for some hardcore OC action ..really piss of the neighbors.. and see if you can F5 your CPU-Z before the cops show up!!
~CL3P20

Do the opposite of what this guy just said if you want the best results you can get
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post #36 of 42 (permalink) Old 05-07-2010, 01:30 PM
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For each resistor, one side will be ground.
Resistors do not all lead to ground. Far from it most don't.

O you who turn the wheel and look to windward, Consider Phlebas, who was once handsome and tall as you. T.S.Elliot, 'The Waste Land', IV

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post #37 of 42 (permalink) Old 05-21-2010, 05:45 AM
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eventually the bios given cannot be flashed into my card...i flashed it shows success but couldnt boot at the next restart..gotta flash back to my original bios...

thankfully can revert back to ori bios
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post #38 of 42 (permalink) Old 01-12-2011, 06:37 PM
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Sorry for bumping an old thread - but it is relevant.

uPI Semiconductor Corp now list the spec sheet for the up6219 buck controller used on the PCS+ 5850's - it can be found HERE.

It shows that:
up6219A = Pin#6 = FB
up6219B = Pin#7 = FB

I have no previous experience with hardware modding GPUs, so I need a few pointers as to what needs to be done to increase voltage.

Please let me know if this is correct:
  1. you need to increase the resistance on the FB pin?
  2. to do that you add specific sized resistors between the FB pin and ground

I've got a pretty decent multimeter that I can use to check resistance, but what I am struggling with is how do I calculate the size of the resistor to use to reach a specific core voltage?

Please let me know what readings are needed to calculate the resistor to be used and I'll post them for you.

Thanks.


Edit: Basically I have just purchased a couple of these PowerColor PCS+ 5850 cards for my BOINC rig and need to increase voltage in the hope of achieving a core freq of 1000.

At the moment, with stock voltage the card is only BOINC stable at 900 core - stock voltage is 1.18 according to BIOS (and bios changes or different firmware doesn't change the voltage).
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post #40 of 42 (permalink) Old 01-13-2011, 09:03 PM
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You are actually lowering the resistance with FB.

Measure the resistance between ground and FB. I use the DVI/vGA bracket as ground. Any ground on the card works though.

Multiply the currant resistance of FB by 20 and use a variable resistor(potentiometer) this size. Example: FB = 2KOhms, 2 x 20 = 40KOhms.

You'll want to remove one of the outer legs of the VR and make sure the VR is tuned to it's maximum resistance before applying the mod.

I think you should duct a leaf blower onto your air cooler...wait till liek 2am and fire it up for some hardcore OC action ..really piss of the neighbors.. and see if you can F5 your CPU-Z before the cops show up!!
~CL3P20

Do the opposite of what this guy just said if you want the best results you can get
~el gappo


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