8800GT voltage mods

[Hazaro]

[QUOTE=VETDRMS;2539282]

How many minutes stable is this?
Is it possible to run some under AtiTool 0.27?
Can you open up Crysis (Not benchmark, get some explosions in there) and play for over 15 minutes?
QUOTE]


30 minutes in ATITool, 6 hours in WoW at 1650x1050 8xAA, 30 minutes or so in NFS: Pro Street, Loops of 3Dmark05/06. I have done 6 loops or so of Crysis timedemo too, no artifacts/locks, ect..

Awesome.

How are you measuring GPU voltage? (multimeter?)
If so, isn't there something to be concerned about putting extra current or something along the lines? (Or am I thinking about other extremely sensitive components?)

I was under the impression that the ones at RadioShack were single turn?
I wanna get this done

Thanks so far guys.

[nelsmar]

the one i got from radioshack def wasnt single turn. its a blue rectangle. i dont ahve the box hadny otherwise ide snap you a shot of it they should have one even if its not online just ask for a multi turn VR or call them up and haev them check. its onyl a dollar or two as well

[Mysterfix]

I just picked up a 1k-ohm VR from radioshack and it's a 15 turn so I think it should be ok.

[Hazaro]

So I checked my card again.

That point is ridiculously small.

I have almost no soldering experience so I'm a "bit" hesitant to do this.

I shall wait longer

Work on my CPU lol...

[Mysterfix]

I'm going to be doing this with no solder at all.

How?

Well I know a little trick with conductive ink and superglue. Simply put you mix up a solution of conductive ink and superglue (gel type works best). Preattach your VR to the card with some double sided tape so it doesn't move around and make sure you prebend one leg of your VR so it makes conact with your solder point when you attach it with the double sided tape.

Once you have the VR in place simply apply the glue solution with a safety pin or any other small tip you happen to have handy and waite for it to dry.

You should also preattach the ground wire to your VR before you place it on the board and follow the same steps above to attach the other end to ground.

[Hazaro]

I'm going to be doing this with no solder at all.

How?

Well I know a little trick with conductive ink and superglue. Simply put you mix up a solution of conductive ink and superglue (gel type works best). Preattach your VR to the card with some double sided tape so it doesn't move around and make sure you prebend one leg of your VR so it makes conact with your solder point when you attach it with the double sided tape.

Once you have the VR in place simply apply the glue solution with a safety pin or any other small tip you happen to have handy and waite for it to dry.

You should also preattach the ground wire to your VR before you place it on the board and follow the same steps above to attach the other end to ground.

At the surface it doesn't seem like it would give a solid connection or conductivity if you mixed in superglue with conductive pen, is the distance just negligible? We aren't talking about a lot of volts here.

Although I guess you could always lower or raise the resistance to accommodate.

But what do I know

How many times have you done this before? Does a liquid superglue really matter?

[Mysterfix]

All I'm doing is making the connections with the resistor using the conductive ink solution instead of solder. I've done it on a couple of cards, X800XT and 7800GT were the latest. The gel type dries slower giving you more time to work with it and it doesn't run.

[jason4207]

So I checked my card again.

That point is ridiculously small.

I have almost no soldering experience so I'm a "bit" hesitant to do this.

I shall wait longer

Work on my CPU lol...

Find an old PCB and practice.

[Hazaro]

Find an old PCB and practice.

Hey Jason

Joining the migrating flock are we?

I need:

Soldering iron
Multimeter
Solder
Old PCB



***

I realize what you are doing with the pen, but I was wondering if the superglue + ink would weaken the conductive properties of it.

I need to get some double stick tape and a pen now. Off to RadioShack I guess. Oh, and a multimeter

[HighT3ch]

Has anyone tried to increase vgpu through bios mod. I increased the stock bios' 3D voltage with Nibitor to 1,22v and flashed it back to my card. It appears to be working as I get far more stable core clocks over 700MHz and up to 800MHz. I guess the voltage increase is small (I didn't have the time to measure it with a DMM) but is probably not even close to the set value. When I'll get home I'll measure it so not to speak hypothetically.

[winbond]

how did you increase the voltage in bios to 1.22v when the highest available voltage is 1.1v?

[d44ve]

I'm going to be doing this with no solder at all.

How?

Well I know a little trick with conductive ink and superglue. Simply put you mix up a solution of conductive ink and superglue (gel type works best). Preattach your VR to the card with some double sided tape so it doesn't move around and make sure you prebend one leg of your VR so it makes conact with your solder point when you attach it with the double sided tape.

Once you have the VR in place simply apply the glue solution with a safety pin or any other small tip you happen to have handy and waite for it to dry.

You should also preattach the ground wire to your VR before you place it on the board and follow the same steps above to attach the other end to ground.

That is defenitly an idea

[jason4207]

Hey Jason

Joining the migrating flock are we?

Yes sir!

This is where the volt-mod action is!

[HighT3ch]

winbond there is an option in Nibitor that enables you to modify voltages for the bios in process. Go to Tools > Voltage Table Editor

[jason4207]

winbond there is an option in Nibitor that enables you to modify voltages for the bios in process. Go to Tools > Voltage Table Editor

Have you tested this w/ a DMM yet to confirm it's working?

[Hazaro]

We need pics!

Off to Radioshack now to see if I can pick up anything.

[VETDRMS]

[QUOTE=Hazaro;2539356]

Awesome.

How are you measuring GPU voltage? (multimeter?)
If so, isn't there something to be concerned about putting extra current or something along the lines? (Or am I thinking about other extremely sensitive components?)

I was under the impression that the ones at RadioShack were single turn?
I wanna get this done

Thanks so far guys.

Sorry for the delay in getting back to you. Yes, I meter with a multimeter. There is virtually no risk metering the voltage using a decent multimter.

The blue 1kohm pots from radioshack are 15 turn. I posted a picture of the mod, VRs included a few pages back. I prefer to use Bourns 25turn pots, but time was of the essence.

:cheers:

[Hazaro]

[QUOTE=VETDRMS;2543426]

Sorry for the delay in getting back to you. Yes, I meter with a multimeter. There is virtually no risk metering the voltage using a decent multimter.

The blue 1kohm pots from radioshack are 15 turn. I posted a picture of the mod, VRs included a few pages back. I prefer to use Bourns 25turn pots, but time was of the essence.

:cheers:

I guess $20 radioshack aren't quality

I will worry about the multimeter later, I picked up the 15 turn 1kOhm resistor from radioshack, had to visit two to get it. Neither had conductive ink pens, as well as the local hardware store. Internet time for me.

*also what % superglue / ink pen?

[JKDC]

Does anyone have resistance readings for voltages? I have the 1k VR from Radio Shack and would like to know what value to preset the resistance. 1.2 volts would be a good start and 1.3 a good ending.

I replaced the stock heatsink with the Thermalright V2 and have 48C load so I have 20C to play with now. It looks like 1.2 volts will be safe, maybe even 1.28 as was posted earlier. So if someone could give resistance readings it will be much appreciated and would benefit future posters/lurkers as this could be a very popular mod soon. Thanks VETDRMS/largon and others for posting pics.

[VETDRMS]

Does anyone have resistance readings for voltages? I have the 1k VR from Radio Shack and would like to know what value to preset the resistance. 1.2 volts would be a good start and 1.3 a good ending.

I replaced the stock heatsink with the Thermalright V2 and have 48C load so I have 20C to play with now. It looks like 1.2 volts will be safe, maybe even 1.28 as was posted earlier. So if someone could give resistance readings it will be much appreciated and would benefit future posters/lurkers as this could be a very popular mod soon. Thanks VETDRMS/largon and others for posting pics.

Always start out at the highest resistance and work your way down. So, attach the VR at 1k-ohm. Measure vGPU on startup, and adjust accordingly. Some people don't like to make adjustments while the system is powered up but I have never had a problem with it, just make them slowly. Give the VR a slow full turn and see how much vGPU went up. This is a decent gauge for adjustments, but keep in mind it will not stay linear. As you approach 0-ohms (lets hope you don't) it will go up much faster.

A little patience goes a long way, but not too much patience. LOL

Edit: I would not recommend the conductive ink/superglue as you will find that the attachment points for vGPU are VERY close together. If you can be 100% certain not to get it spread out, maybe. Soldering is not difficult, it just takes some practice, so find a dead board or an old soundcard or something and practice. Too much heat will kill those small thin-film resistors we are soldering to, just keep that in mind.

[JKDC]

Can't I start it at 500 ohms? It was stated earlier in the thread that a 500 ohm would work also. I hooked it up to my MultiMeter and it took me 2 minutes of cranking to go 250 ohms. LOL It would be nice to set it closer to the actual value I need.

[HighT3ch]

Have you tested this w/ a DMM yet to confirm it's working?

Jason no, not yet - didn't have the time. I'll do it during the weekend as I'll have more spare time. All I can say for now is that it actually affects the OCing ability but I don't know any real voltage figures.

[largon]

Can't I start it at 500 ohms? (...)

[JKDC]

Has anyone tried to increase vgpu through bios mod. I increased the stock bios' 3D voltage with Nibitor to 1,22v and flashed it back to my card. It appears to be working as I get far more stable core clocks over 700MHz and up to 800MHz. I guess the voltage increase is small (I didn't have the time to measure it with a DMM) but is probably not even close to the set value. When I'll get home I'll measure it so not to speak hypothetically.

I can confirm that this is working. I tried 1.25 and 1.3 but got the same results. I now set it to 1.2 volts and have the same OC. I imagine this only goes to 1.15 on the card. My OC went from 702/1722 to 756/1836. I set the lowest voltages to 1.1 and the two highest to 1.2. You have to edit the voltages before they show in the table. My temps went up 2C idle and 3C load with a thermalright V2 cooler. With stock cooling you better have the fan speed up to 50%+ before trying this.

It's still not enough to stop the vmod unfortunately but it is free and easier. Make sure you have the latest NBitor (v3.5a) and NVflash (v5.57). Previous versions don't support the 8800GT. Use the thread on extreme bios mod for the 8800GT for switches and floppy DOS image. Remember to back up original BIOS first and have a spare PCI card just in case you need to flash it back.

[Merc1212]

JKDC - that's great news. I was getting ready to do the voltmod, but I'd be happy with another 50mhz from just the bios mod. Can you confirm how much more voltage it is sending with a dmm? Which brand of card are you using?

Thanks!