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OCN's V'mod Squad's, Volt Mod Essentials! - Page 126

post #1251 of 1302
Here some GIGABYTE HD 6670 voltmod thumb.gif
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post #1252 of 1302
A short noobs guide to measuring resistor values written by myself.

http://www.benchtec.co.uk/forums/threads/8399-How-to-correctly-measure-resistor-values
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post #1253 of 1302
Fixing a GTX570. It was working but only at 600/1200/1600 (stock 742/1484/1900), if it was stock there would be huge artifacts and it would crash a lot. Got it from 2nd hand. So here goes the process.
gtx570.png
It was flashed to 600/1200/1600

img2806-readouts.jpg
Searching for them.

img2811.jpg
Found, fixed.

img2812.jpg
Just 2 caps. This was a mini fix for it. There was little gain in stable mem clocks, not even close to stock 1900MHz.


Then found this:
img2819-missing.jpg
They were indeed a CAP and a resistor. But I didn't know the value of it and neither did the internet. Without the resistor on, the spots were measured 336OHM.

With help from CL3P20 We figured the value of that resistor will be ~48OHM, and then I did this.
img2827.jpg
img2829.jpg
The resistance on that VR was 47.3OHM and I could clock the card back to 1900MHz Mem, and even 2000MHz

Sadly I didn't have fun with it and try to lower the resistance even more to see if it allows even more mem clocks. =] I hear "super memory modding" coming! (CL3P20s idea!)

Final result:
img2830.jpg
img2832.jpg
This resistor is 41OHM
fixed-570.jpg
mem-test.jpg

Then I flashed it back to its original state and did extensive testing. It's 100% stable and working, even at 800/1600/2000 with +0.012v (1.025v) on core.

I need to thank CL3P20 for the help!

Sorry for the long post, here's a potato! upsidedwnsmiley.gif
EDIT: had to fix all my pictures cuz they weren't working!
Edited by madness777 - 10/15/12 at 8:16am
post #1254 of 1302
Thread Starter 
Awesome work thumb.gif
    
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post #1255 of 1302
vPLL For MSI GTX570TFIII just confirmed.

Shrani.si
Edited by madness777 - 10/15/12 at 8:22am
post #1256 of 1302

Full mods for GPU core of MSI 5770 Hawk

 

 

1000

 

 

 

5770_hawk_GPUv.jpeg 158k .jpeg file
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post #1257 of 1302
Vcore mod for 55nm 260GTX Twin Frozr (not lightning)

Vrm controller: ON Semiconductor ADP4100
Figure 2. FB connected direct to Vsense through 1.21k resister (other resistor are for filters). FB to ground measured 1.8k ohms. Used 50k ohm vr since I didn't have anything smaller that would work. This gave a .03v increase in idle vcore.

Mod point is a nice solder ball just to the right of FB. There is another one if you continue to the right, but this was was less surrounded. Connect other side of vr to ground point. There are a few caps with a connection to ground nearby.






Vmem mod.

Vrm controller: uP6161
From the "Typical application circuit" picture, Vout is sent through a resistor divider to FB pin 4. A simple vr to ground will do the job. Measured ~700ohms. Used a 10k ohm vr.

It's a SOP-14 package, so with a steady hand, you can mod direct to pin 4. I used a nearby cap for the gnd point.




Results:

2.3ish volts on the mem made it run 1300+ http://hwbot.org/submission/2303477_

After 1.25v on the core, OCP started to kick in. This did allow the core to run at 850 or so. OCP mod to follow.
Edited by just_nuke_em - 11/12/12 at 4:59pm
 
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post #1258 of 1302
Thread Starter 
Finally got the OP undated with all the submissions from the last 8 or so months. Sorry it took so long, but it's done biggrin.gif



Don't have time to search thru all the V'mod threads for additional info, so if you have a confirmed mod you would like to share, please post them and I'll get them added.


Thanks once again for all the help grouphug.gif
    
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post #1259 of 1302
Thanks for the update smile.gif

I have a few older cards I need to mod but haven't had time maybe soon tongue.gif
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post #1260 of 1302
I modded my reference EVGA 275 that I purchased last week. I'll update this thread with actual photos when I get home.

Mods performed:
  • vGPU
  • vMem
  • OCP
  • Read Points

GPU Controller: ADP4100 (Click to show) Stock resistance is 2.9kΩ. 2900 x 20 = 58000 ≈ 50KΩ.
Connect a 50KΩ VR between FB (PIN 18) and GND.

(Click for larger image)

Mem Controller: uP6161 (Click to show) Stock resistance is 700Ω. 700 x 20 = 14000 ≈ 20kΩ.
Connect a 20kΩ VR between FB (PIN 4) and GND (PIN 12 or any GND).

(Click for larger image)

Read points:
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