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X1300 And Non-Ref 5870 V-Mod

post #1 of 25
Thread Starter 
Hey guys.
Got a soldering kit ready. Voltage meter will be next. Ready for my first series of volt mods.

Need some help looking at these cards, have the high res pics ready.

X1300:
http://slappa.ln2cooling.com/?Qwd=./...v=thumbs&Qis=M

5870:
http://slappa.ln2cooling.com/?Qwd=./...v=thumbs&Qis=M

Need to know what supplies i need. If you cant read the IC's let me know and i'll get them for you.
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post #2 of 25
For the x1300 I'm thinking the RT9232A IC on the back near the ports is the vgpu, looking at the datasheet pin 5 would be the mod point.
The RT9232 near the back of the card should be the vmem mod, also pin 5 for the FB.

First I check the stock voltages of the card.
Now to get the VR size, with the card out of the rig & unpowered measure the resistance between the feedback (pin 5) & ground (any ground on the card, pin 7 on the same IC is also ground), then take that value & multiply it by 20 to get the approximate VR size (if 2k ohms measured = 40k, VR nearest size is 50k).
For the VRs you want to use the center & 1 of the outside legs, set the VR to the maximum resistance & solder it in (I usually try to get it so when the VR is glued to the card I turn clockwise to increase resistance = decrease voltage, & always have them turn the same way so i don't mix it up on different cards).

That is basically it, hopefully pizzaman or mAlkAv!An can chime in & confirm I have the right mod points.

For the 5870 I think the NCP5395t is the vgpu mod, that one is a bit trickier, there are 2 different FB points on the IC & I'm not sure which to use, thinking vfb at pin 18 but there is also vdfb at pin 20. Will probably have to trace it to a resistor nearby & mod from there...
Edited by FtW 420 - 1/7/11 at 9:59am
    
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post #3 of 25
Hi, I was just labelling the pics while you answered

For the X1300, just do as Ftw said. Measure resistance between the marked pins if you get your multimeter.

HD5870: Pin18 of the NCP5395 does control vGPU. I cant tell from the pic where the trace leads to, so you have to check if it's connected to one of the green spots f.e. by measuring the resistance or continuity testing.
For the vMEM mod it would be nice if you can take a pic of the full front and back of the card.


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post #4 of 25
Wow that X1300 brings back memories. That was my very first Vmod that I had ever done with the help of Pizzaman! i eventually bricked the card(no fault of Pizza) I just got overly excited and penciled way to much. VR's are the way to go and patience will make it successful. Good luck on the mods!
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post #5 of 25
Thread Starter 
Thanks for the responses guys.

I did the mod on the x1300 with a 50K pot. It wasn't posting so i unsoldered and removed the mod. The card was still working

I then tried the mod again, this time it killed the card, as i haven't been able to revive it yet. I'll probably go out and buy another cheapo card to play with because i don't want this happening to my 5870
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post #6 of 25
Thread Starter 
Heres an image of the tracing on the 5870

http://slappa.ln2cooling.com/5870VoltMod/IMG_3102.JPG

some guidance would be great
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post #7 of 25
Looks like this:
http://www.overclock.net/attachment....1&d=1294643472

You can verify the tracing by first measuring resistance from Pin 18 of NCP5395 to ground. Afterwards you check the resistance of the other spot's i've tagged in the picture, if both are equal they are connected.
Every point that is connected to Pin 18 can be used as a soldering spot. The pin itself, too. But it's just way to small that's why the track tracing is necessary in the first place.
If you have measured the resistance we also of what size the variable resistor should be for the vGPU mod.

greetings

Edited by mAlkAv!An - 1/9/11 at 11:22pm
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post #8 of 25
Thread Starter 
Quote:
Originally Posted by mAlkAv!An View Post
Looks like this:
http://www.overclock.net/attachment....1&d=1294643472

You can verify the tracing by first measuring resistance from Pin 18 of NCP5395 to ground. Afterwards you check the resistance of the other spot's i've tagged in the picture, if both are equal they are connected.
Every point that is connected to Pin 18 can be used as a soldering spot. The pin itself, too. But it's just way to small that's why the track tracing is necessary in the first place.
If you have measured the resistance we also of what size the variable resistor should be for the vGPU mod.

greetings
Thanks for the quick response malk.

All the points that you advised are giving me continuity readouts, but where would I connect my DMM to GND (dumb question I know) is it a pin on the IC, or where is the best place to measure?

Thanks
Edited by Slappa - 1/10/11 at 12:03am
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post #9 of 25
You can use the slot bracket or screwing holes f.e. The PCI-E power connector has got 3 ground Pins, too.
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post #10 of 25
Thread Starter 
Quote:
Originally Posted by mAlkAv!An View Post
You can use the slot bracket or screwing holes f.e. The PCI-E power connector has got 3 ground Pins, too.
K awesome. So if all those points add up to the pin 18 to ground then we know we have them all?
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