7900GT over voltage protection?

[dino-new]

Codeman,

Thanks for the response. ya that's more my speed. Can you tell me a little about conductive ink? I'm not sure what it is. Will it supply zero ohms or near it between the connections? Or is it some length x ohms per inch trick? Where do I get conductive ink?

Thanks,

Devin

[***Deimos***]

conductive paint = car defrost kit... ie the paint you use to repair those thin defrost wires on windshielf. Try car hardware store maybe...

[dino-new]

Is the purpose to effectively short out the contacts? Or does it supply a specific resistance to the connection?

-Devin

[ST4]

Is the purpose to effectively short out the contacts? Or does it supply a specific resistance to the connection?

-Devin

purpose is to change the vid strapping so it will output 1.4V via the Hammer binary code...

[***Deimos***]

Is the purpose to effectively short out the contacts? Or does it supply a specific resistance to the connection?

-Devin

Unless you are willing to cut the legs of the IC, or cut traces, the only Vid pins we have to work with are those that are by default set to 1.

The IC uses some thresh-hold to determine which binary level is present.. if the voltage is less than that thresh-hold its read as a 0. If its greater, than its a 1. The thresh-hold is probably something like 0.5-1V. The default connections on the PCB are probably some small pull-up resistor to Vdd (+5V??) to get the "1", and probably just route straight to ground for "0".
So to answer your question, yes it does short to ground, and although thresh-hold corresponds to some resistance (with pull up to Vdd), you shouldn't think of it that way, since we are connecting to ground.

Obviously, I'd be able to go into further details if I had a 7900GT in my hands now...supply issues... -_-

[DesertShooter]

There are some extra place's to do the +0,05v, +0,1v, +0,2v:

[pcfreak]

The "right" pad. Picture is correct. Sorry for the confusion. I was trying to say just look at the connections in the picture, I should have not said a left or right at all. I was meaning the next pad to the left of d511 "in the picture" didn't come out sounding good at all. I typed that wording really bad.

It's why a picture is worth a 1,000 words. Always look at the pictures, words can be easily mistyped, misinterupted, etc

Thanks for clearing out! Typos happen...

[Ebola]

Is this correct for an easy 1.55V voltmod ?

[t024484]

Is this correct for an easy 1.55V voltmod ?

Yes it is.
But look here for an even easier way to go.
http://www.xtremesystems.org/forums/...61#post1359661

[dino-new]

***Deimos***,

Thanks for the clarification and in-depth explanation. That makes it clear.



DesertShooter,

I notice that the picture you supplied indicates that something has to be done to stop the overvolt protection. Other examples have left this out. Is this required for all of the examples?

-Devin

[Dihon]

Here's my experience with ASUS 7900GT which got 11.304 on 3DMark05 http://service.futuremark.com/compare?3dm05=1914868
Core / memory = 690 & 1000

I only replace the resistor with 50K to get 1.5 V.
No need to remove any resistors, in my case, I get a blank screen.

[TimB]

Yes it is.
But look here for an even easier way to go.
http://www.xtremesystems.org/forums/...61#post1359661

Might just be me being thick but the one he posted looks easier, though tbh I don't fully understand the other way. That thread just confuses me, though I have no experience in electronics so the "draw a line with conductive paint" method appeals to me more.

I was going to do the 1.4v mod on my XFX 7900GT tomorrow but am now tempted by the 1.55v one.

[***Deimos***]

allow me to re-emphesize... all you need to do is on the picture.. this is the easiest mod... only one connection.. there are no resistors or anything like that.. just paint one (1) line.. its as easy as it can get.

7900GT 1.4V Vgpu.
Done by: illuminati-hwt
Difficulty: easy <- confused?.. this one is for you.
Tools: Car defrost kit, tape (to mask out where the ink goes)

[Greg_1]

Is this the 1.45V mod ?

[TimB]

Wouldnt that be 1.55v Greg?

Deimos, I understand that, what I dont understand is the need to be soldering all different kinds of resistors when a simple line of paint does the same job? Was wondering if the soldering method has more advantages. It certainly doesnt have the advantage of you being able to "un-do" the mod.

If i wanted to do the 1.55v mod like above, would I be better to do it that way or the other way.

[computerpro3]

Is this the 1.45V mod ?

Is this seriously all you have to do for 1.55v?

Also, do you think 1.6v is safe 24/7 in the following WC loop

Thermochil PA120.3 with 5x 120mm fans
2x Aqua Xtreme (swiftech mcp600) pumps
Cather Silver Storm G5 block
DD Chrome Maze 4
DFI Expert Chipset

[Greg_1]

No ! Can't you see a question above the pic??
@TimB, for 1.55V you have to link together D508,D511 and one unsigned, for 1.5V link D508, D511 to gnd.
And I'm aksing is the link D511 and the one unsigned gives 1.45V

[Garrett]

computerpro3, especially for you, the 1.55V MOD!!!!!!!
http://img458.imageshack.us/my.php?i...vmod1552oc.jpg

[dino-new]

Dude!!!! you guys rock!!@!

I went ahead and made a micro wire solder to connect for the 1.4v mod instead of the conductive ink. Now I hit 655mhz on the oc for the 7900gt. Just like a GTX!!!

-Devin

[dino-new]

how do you set the max mem clock higher? Mine maxs at 800 in the nvidia control panel.

-Devin

[Mysterfix]

Dude!!!! you guys rock!!@!

I went ahead and made a micro wire solder to connect for the 1.4v mod instead of the conductive ink. Now I hit 655mhz on the oc for the 7900gt. Just like a GTX!!!

-Devin

Does anybody see a patern here? It seems that all of the GT cores will do GTX speeds when given the same voltage as the GTX. I suspect that may be why they decided to give them less voltage in the first place.

But thanks to the Aces over here at XS we now have the means to get every last drop of speed out of these little monsters!

[TimeOut]

My 7900GT arrives tomorrow. I can't wait to do the 1.4V Vmod.

I already have the conductive pen in my hands.

[Mysterfix]

I'll be ordering mine tomorrow hopefully.

[tadh]

Wow! I just did the 1.55 volt mod on my BFG7900 GT and even the nvidia control panel utility auto-detected it from 526 GPU to 680GPU

Powerstrip runs up to 700 and it still goes strong! Anyone know of another utility to go above 700 on the 7900 GT series besides Powerstrip??

[***Deimos***]

IN POWERSTRIP:
select "Performance Profiles" from the icon, configure... you are in the overclocking window. Now, double click on the picture of the black GPU, and/or the picture of the gray memory chip. A windows pops up that allows you to change the maximum clock limit.. increase this number to allow a higer range.

tadh,
first time overclocking so high, huh? Kinda makes you feel warm and fuzzy like underwear straight from drier, doesnt it :p