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post #331 of 1500
Quote:
Originally Posted by Martkilu View Post
I haven't measured the mem IC yet, only the GPU one. Do I measure the FB to GND pins again? That would be pin 4 for FB, 7 for GND on the APW7067N IC.

Also last time I measured for 200k, 20k, 2k because I wasn't sure which to do. Which should I do this time? Or all of them ?
Yes, FB to ground, and use the 2k on the DMM
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post #332 of 1500
Quote:
Originally Posted by Voltage_Drop View Post
Yes, FB to ground, and use the 2k on the DMM
Alright, be back soon
Just curious what does the FB mean and how does the resistance affect it/the chip?
post #333 of 1500
Quote:
Originally Posted by Martkilu View Post
Alright, be back soon
Just curious what does the FB mean and how does the resistance affect it/the chip?
FB is the feedback which controls the output of error amplifier. You set the error amplifier with resistance in parallel with the COMP pin to keep it from going over a certain voltage to protect the components. By lowering the resistance of the feedback loop it allows for more voltage by upping the error amplifiers setting.
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post #334 of 1500
Quote:
Originally Posted by Martkilu View Post
Alright, be back soon
Just curious what does the FB mean and how does the resistance affect it/the chip?
At 20k it starts at ~7.5k and just goes up by .01...forever it seems like. Got annoyed past 10.8 so I put on 200k and it's at 18.3

Quote:
Originally Posted by Voltage_Drop View Post
FB is the feedback which controls the output of error amplifier. You set the error amplifier with resistance in parallel with the COMP pin to keep it from going over a certain voltage to protect the components. By lowering the resistance of the feedback loop it allows for more voltage by upping the error amplifiers setting.
So how does the pot "override" the other resistance? Or do they go together, and if they go together then wouldn't it just lower voltage? (just trying to wrap my head around it)

Edit: Added an extra fan to help keep load temps down, just a temp solution until I get the hsf


Edit: The extra R4 fan allows 695c,1515s,890m at 87c max load, as opposed to the old 690c,1500s,890m at 105-107c load
Edited by Martkilu - 1/22/10 at 3:36pm
post #335 of 1500
Quote:
Originally Posted by Martkilu View Post
So how does the pot "override" the other resistance? Or do they go together, and if they go together then wouldn't it just lower voltage? (just trying to wrap my head around it)
Pal u must study a little psysics!!
By soldering a pot in parallel with the stock resistor u lower the OVERALL resistance!
Say u have 5kOhm stock resistance.
If u add a 100kOhm in parallel, u have a new combined resistance
Rnew=(Rstock*Rpot)/(Rstock+Rpot)
Rnew=(5*100)/(5+100)=4,76...kOhm!
There u go!U lowered the resistance so the error amplifier is tricked and will increase the voltage!(am i right Voltage Drop??)

U get how it works?
    
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post #336 of 1500
Quote:
Originally Posted by theo.gr View Post
Pal u must study a little psysics!!
By soldering a pot in parallel with the stock resistor u lower the OVERALL resistance!
Say u have 5kOhm stock resistance.
If u add a 100kOhm in parallel, u have a new combined resistance
Rnew=(Rstock*Rpot)/(Rstock+Rpot)
Rnew=(5*100)/(5+100)=4,76...kOhm!
There u go!U lowered the resistance so the error amplifier is tricked and will increase the voltage!(am i right Voltage Drop??)

U get how it works?
I know some basic basic physics (I slept through the high school course last year but I'm planning on learning more. That makes more sense now, just a tad hard to wrap my head around. Is there a way to calculate how much resistance ups the voltage? If I soldered the pots on now with that resistance how much would it raise voltage ? How do you figure out what size pots are needed based off of the resistance?
post #337 of 1500
Quote:
Originally Posted by theo.gr View Post
Pal u must study a little psysics!!
By soldering a pot in parallel with the stock resistor u lower the OVERALL resistance!
Say u have 5kOhm stock resistance.
If u add a 100kOhm in parallel, u have a new combined resistance
Rnew=(Rstock*Rpot)/(Rstock+Rpot)
Rnew=(5*100)/(5+100)=4,76...kOhm!
There u go!U lowered the resistance so the error amplifier is tricked and will increase the voltage!(am i right Voltage Drop??)

U get how it works?
Yes you are correct Theo . And physics is a must to completely understand the concept of electronics as it is the father of electronics. Though I really dont look at it as tricking it, more as in setting its value. The factory predetermines the FB resistance which controls the error amplifier to keep it within the tolerance of the chip or GPU. We, as volt modders, are just adjusting this setting to create our own effects to push our components. Most of the time a component(such as a GPU or CPU) can take more than what they set it for. Though they are weighing in the performance vs longevity when they decide on its value as oppossed to us. We dont care about how long it will last because by then it more than likely time for an upgrade

@markilu-general rul of thumb for finding the correct amount of resistance is to take the original resistance of the FB->ground value and to multiply that by 20. Notice how Theo picked a 100k value for the mod and that the stock value of the FB was 5k. He chose that becuase it was the multiple of 20 and it came really close to the factory value of FB resistance.
Edited by Voltage_Drop - 1/23/10 at 11:07am
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post #338 of 1500
I dont think there is a way to calculate the voltage increase cos i dont think the VRM circuitry is linear( ) but u can write down the values u get from several pot decreases and u ll get a basic idea.Thats why u need a DMM after all!!!!

U can figure out the pot value by the resistor u are planning to solder in parallel with.
Say the stock resistance is 4,5 kOhms u multiply by 20 =90 so u ll get a 100kohm pot.

Of course the more u lower the resistance of the pot,the faster the overall combined resistance will increase...So be careful!I remnd u ,the values are not connected LINEARLY!!!


(ps:hit the +rep button once in a while )
    
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post #339 of 1500
Hey Pizzaman I would recommend adding this to the gtx260 portion.

If anything it will make a quieter card. Replacing the stock caps with a little higher voltage capable caps.



Forgot to add the other pic


Edited by MADMAX22 - 1/23/10 at 10:00pm
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post #340 of 1500
@ maxx - I see 3x blank spots for additional inductors too...which will definitely knock the whine down a lot more...problem is finding similar inductors to use
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