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OCN's V'mod Squad's, Volt Mod Essentials! - Page 49

post #481 of 1500
Red or black??!!

Hey Pizza, I've tested and clarified OCP mod for 5870. It allows me up to at least 1.42v on two cards under water. One card can do 1.5v for at least a short time.



Here's a pic of the mod on one of my cards:



The other card I burned out the soldering pad on the PCB so I had to solder the resistor directly to the controller pin. Works just fine.

Also, here's a link to the evbot GPUv hard mod. Not useful for most folks because you need to have an evbot. I've done it on both cards and it works fine. Downside is that you actually have to be in 3D mode at the time you set voltages or it will just adjust the 2D voltages.
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post #482 of 1500
Thread Starter 
Thanks for the heads up. That's the volterra vt1165mf, correct? Asked XS to clarify which pin was connected to OCP a couple weeks ago and never got a reply.

Do you think a 20K VR would work? Maybe tuning to a lower resistance you get you further.

+rep, a very good job


Not updated yet, but will be soon.
    
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post #483 of 1500
Quote:
Originally Posted by PizzaMan View Post
Thanks for the heads up. That's the volterra vt1165mf, correct? Asked XS to clarify which pin was connected to OCP a couple weeks ago and never got a reply.

Do you think a 20K VR would work? Maybe tuning to a lower resistance you get you further.

+rep, a very good job


Not updated yet, but will be soon.
You can use 20k VR and tune it...that will work as well.. but the existing resistor must be removed before the mod is functional. Thanks to Patch for testing this one out..after the fact. A lot of folks have been PM'ing me at XS trying to get more info on this IC.. I posted everything I had .

*18k is the max 52A setting for the circuit..tuning lower provides nothing.
post #484 of 1500
Quote:
Originally Posted by Voltage_Drop View Post
Sorry to hear about your vision man, dont strain your eyes or you will only make them worse.
Yeap... getting old sucks. I have 20/20 at 5 feet and greater, but put something right up in my face and I'm blind as a bat. I'm wearing glasses right now to be on the computer. When I go out on my boat though, I can see things wayyyy off in the distance that nobody else can make out.
post #485 of 1500
I used a 20K VR on the other card and dialed it to 18K before soldering. If I find time, I may play with it a bit to see if I can improve things some. I won't know what resistance I'm changing the resistor to, but I can measure overall resistance across the circuit to get back to my starting point if needed. If I remember correctly, it's about 13.5 K with the 18K resistor in place.
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post #486 of 1500
Thread Starter 
5870 OCP and EVBot links updated Patch. Once again, thank you very much.

Made a slight change to the OP title. Felt appropriate being stickied and all.

Also added link to the V'mod Squad.
    
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post #487 of 1500
I know I'm only going for a pencil mod, but I have a couple of questions.

1. How many strokes does it usually take to shade a resistor, I was thinking of doing three at a time then re-checking voltage? Is that too low or too high?

2. I've heard pencil mods can degrade, how quickly does this usually happen?
post #488 of 1500
Quote:
Originally Posted by coffeejunky View Post
I know I'm only going for a pencil mod, but I have a couple of questions.

1. How many strokes does it usually take to shade a resistor, I was thinking of doing three at a time then re-checking voltage? Is that too low or too high?

2. I've heard pencil mods can degrade, how quickly does this usually happen?
1. I usually do just do a few strokes, from end to end, measuring the resistance each time to make sure it is not to low from the stock and then check the voltage output afterwards. Penciling is time consuming because it is hard to nail down that perfect resistance. So that is why I usually just use a VR and adjust on the fly.

2. Not sure about the life expectancy of the applied lead because like I said before, I gave up on that method for ease and precision. I believe PizzaMan added some info on penciling in the beginning of this thread and states the best pencils to use for the mod.

EDIT: You have the general idea down of being moderate on the application and checking the output afterwards

What card are you modding, the 4850?
Edited by Voltage_Drop - 2/5/10 at 3:25am
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post #489 of 1500
Thread Starter 
I had a dream the other day. I dream about a "Resistance Pen". The pen has a wire coming for the end that is long and has a alligator clip for clipping it to a ground source. The tip is tiny and very sharp for probing and even being able to press a little bit into solder points to keep it place a little better. The middle of the pen is a series of VRs: 400K, 100K, 50K, 20K, 10, 1K, and a 500Ohm. Giving the pen the ability to tune between no resistance and ~580K with great precision and the ability to test possible mod points for voltage increases on-the-fly. ahhhh, what a great tool it would be. Another perk would be to give it a build in DMM to display its own resistance.
    
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post #490 of 1500
That's a great idea. And doable. You could even rig something up like that at home.

Now if they could only come up with some type of removable conductive glue (think post-its for solder points)......
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