7800GTX overclocks with Volt Mods??

[ssg3000]

Hello Hitman 47,

Take some photos of your mod for us and place them on here so we can see what you've done. It will help a lot.

Thanks
Mark

[Weee]

I've done the mod today on my BFG cards, I will post up some results when they come. Tried to make it look at ViperJohn like as possible!

Okay, I went ahead and did it, my vgpu was 1.5V afterwards, then I go to turn the pot, and it popped right off! bad solder joint =*( voltage dropped down to 1.43 otherwise everythign was ok. I'll have to wait until tomorrow to try out that card again. Time to try out the one I actually know I did a good soldering job on (2nd card)

Just took it out to have a look, apparently the entire solder pad side of the C525 ripped clean off! anyone have an idea what the value of this cap is? I mean be best off to replace it if I ever want to try this mod on that card again.

okay so edit #5 or so:

so, the cap itself #525 is okay, I have decided if i want to do vgpu mod I'll be taking a wire out to the edge of the card. However, on BOTH of my cards, I managed to pull off BOTH of the attachment points for the mod, so I am currently stuck at the stock voltages! I am wary to try the "other" version of the mod because I haven't seen any confirmation of it working . VDD mod went okay on both cards, so for now I'm stuck... I would buzz out looking for another available place to do the solder point, but I lost my pads! Thanks to anyone that can find it for me

[ssg3000]

Weee and others,

I've noticed a lot of you have had problems with the Variable Resisitors coming off after you solder them on. I don't know if you guys took notice to what Viper John has done his mod, but he has used Sticky double sided pads.. or cut strips of 1-2mm thick double sided tape to the same size as the variable resistor which holds the resistors in place on the back of the GFX. I did exactly as Viper John has in his pics and had no problems, it actually holds them on very firmly. This tape is readily available in most electronic stores. Just letting you guys know it works quite well through my experiences.

Mark

[ssg3000]

I don't know if i personally would put superglue on the back of my card, but I guess if your willing to solder on VR's then your already voiding warranty so who cares :p

[ssg3000]

Hooray For LOCTITE

[Weee]

Hey, Thanks for the advice... I actually used some double sided foam tape to secure the pots, but it was too porous and didn't hold the parts secure, i had just grabbed it from some stuff that came w/ my cold cathode kit.

I think the main problem with what I did was the fact that on the vGPU mod I used a pot who's turner comes out of the side.

Here's a photo albeit unclear, it is the best one I have



Both mods looked pretty much identical.

Couple with the fact that my pot was basically 90degrees to the solder joint and the give in the foam I used, the lateral stress caused the solder joints to break. I tested out both cards and they both clock as high as they used to before the vmod, so I am not terribly devastated just yet. I also had a chance to use the vdd mod to help out my good core clocking but poor memory clocking card.

Before:
http://service.futuremark.com/compare?3dm05=1222782

After:
http://service.futuremark.com/compare?3dm05=1253199

Unfortunately, I was hoping to get the better gains on the GPU clock because my grafx are peltier cooled and when only one is on the loop, I get about 6C load temps, I figured I could push these cards fairly far individually =\

So,

If anyone could reply with some advice to get the mods to work or shoot me a PM with some advice, it is much appreciated!

Edit:I can take photos if needed!

I moved the rest of this into the next post once I got a better picture

[Weee]

Sorry, Just to verify,

It is my belief that these 4 points are all electrically connected, and I was hoping someone would verify in this thread if they have done a connectivity test, just to remove all confusion about the mod.

[Hitman47]

Where do you have grounded the measuring points now?

I do believe that this is the reason, that the measurement does not supply correct values.
The Voltmod actually seems to function, if I turn the VR e.g. on 0 ohms and/or too far, the graphiccard switches off itself.

Could you please tell me your measured values of vcore and vdimm at booting time?


I did the mod in the other way:

In my case the potentiometers and installation voltmeter are in an external console over the case.

At my graphiccard there are only soldered wires. But these wires are ok: no short-circuits or too high resistance. Approx.. 0.6 ohms
Voltmeter is ok, too

[Weee]

I use the ground on the pci-express connector to do my voltage measurements. at boot up I used to get 1.213V and now I get about 1.27V, after boot up i used to get 1.413 and now I get 1.483. By the way, attaching to the smd component shown above seems to have solved my lost pad problem

[ViperJohn]

Sorry, Just to verify,

It is my belief that these 4 points are all electrically connected, and I was hoping someone would verify in this thread if they have done a connectivity test, just to remove all confusion about the mod.

You are correct.

Viper

[Weee]

Alright, here are my numbers after one night of playing.

http://service.futuremark.com/compare?3dm05=1259173

Need a much better cooling for ram solution still, hard to get fans around my liquid cooling tubes on the graphics in a case!

ah yes, forgot to mention, this is at 1.52vGPU and 2.45 Vdd

[Ubermann]

Can anyone show me a good ground point, i dont want to use that little pad on card that i have seen on guide.
And im kinda lost where to find that guide again from Viperjohn.
I am going to use cables and set VR at power connection and one at monitor connection.

[Ubermann]

Hoooah nice score =)
Im happy if i will hit 10500 on air.

(OT..will my avatar upset US people ?)

[Weee]

Another possibly useful piece of info for someone out there, on one of my two cards, I do not have the ISL6592 but this:



volt mod works fine, the card is a BFG 7800GTX

[Gaaya]

What is the max voltage for gpu on air? (given whatever temps). Also, why does my 100K ohm resistor not give me a good margin of adjustment? It goes from 1.45ish straight to 1.6+ without anything between. Its a 100K OHM 64W-104 cerment 25-turn.

[ViperJohn]

What is the max voltage for gpu on air? (given whatever temps). Also, why does my 100K ohm resistor not give me a good margin of adjustment? It goes from 1.45ish straight to 1.6+ without anything between. Its a 100K OHM 64W-104 cerment 25-turn.

100k is for the memory volt mod. You use a 200 ohm on the Vcore mod. A 100k on the Vcore mod should have had no effect at all in the mod was done correctly so double check the trimmer value.

Viper

[ViperJohn]

Gaaya you dont use a 100k, lmfao

you sue a 100ohm VR

100k=100,000ohm
100=100ohms
you 'MUST" ONLY USE A LESS THAN 200OHM VR FOR VGPU.
lucky your card didnt fry.

100k you can use for the VDD

An extremely confusing post. Use 100k for Vmem and 200 ohm for Vcore...nothing else.

Viper

[ViperJohn]

LOL, I was one of the founders of the vgpu mod
100ohms and 50k work fine for the mods, but yeah 200ohm and 100k work for more safer voltages.

not confusing looking at it from his stand point as he was fixed on a 100k ohm vr.

Oh please. The thread was started by one of my customers July 1st. You showed up in late September LONG after the work was done lol.

100 ohm on the Vcore would give a minimum of about 1.610 loaded HP3D Vcore which is a bit high.

Viper

[eclypse]

Ok after going threw this long thread i'm confused about where to attach these mods or the right way.

I just finally got my Bourns parts in the mail today a few mins ago:

3296w-1-201 200 ohms
3296-w-1-104 100K ohms

The mail man delivered it to the wrong house last Sat.. saying that the lable was mostly torn away and theres another street with a simular name.. Bull crap i tell ya.. but i'm happy i finally got the package!.. Only after calling the post office atleast 4 times till someone would finally call me back with some news.

Just a post number or link will do..

Thanks

[harleybro]

Oh please. The thread was started by one of my customers July 1st. You showed up in late September LONG after the work was done lol.

100 ohm on the Vcore would give a minimum of about 1.610 loaded HP3D Vcore which is a bit high.

Viper

Hey VJ yeah I think you didn't realize MM is Jason57. I know he was one of the mod founders since I had a modded card from him before the thread started.

This is from post #29 in this thread.


Quote:
Originally Posted by symbolized?
Very nice... well done
Only Vcore is missing to make me completely happy - on vrzone a guy reached with a vcore mod 630 mhz on air... :-/


That is Jason57. We have emailed a couple of time. The card did a tad over 11k on dry ice. It appears to be an exceptionally good card but there isn't enoygh data yet to know what are going to be poor, average, good and "oh my god" cards yet in the luck of the draw.

[eclypse]

This is all nice an all guys.. but can anyone point out the post with the correct methid so i can get these mods started on my 2 7800GTXs?? LOL!

[eclypse]

No i mean which GPU mod is the better way?

[Weee]

This what my WHOLE point in making the post that I did Mr. Eclypse! Showing the four dots and the points are equivalent, verified by Mr. ViperJohn himself, I was trying to help the masses, but one slipped through the cracks =(

[eclypse]

Yup noticed your post on that Wee..

Ok so i would want somewhere around 1.5-1.7v for the gpu under water and what would be a range for the vmem?

[Weee]

I must once again say that I love the volt mods, first time I ever did one, and I am super happy w/ the results (i'd be sure you already know how to solder though!)

http://service.futuremark.com/compare?3dm05=1268751

cores at 1.62, mem at 2.6V approx on both cards