7800GTX overclocks with Volt Mods??

[maverik-sg1]

@ Viper J - sorry mate, I relaised what I had said after I already posted and will set up individually before going SLI.

Cheers

Mav

[PHILIP1193]

goign to be trying this tonight using viper johns pics as a guide. Ill show you how i do too

phil

[ssg3000]

Hello to all, this is my very first post! I have a quick question in relation to my XFX 7800GTX. I have never completed a vmod on any piece of hardware until this card. I am a very keen and avid computer user, also a computer technition, and are confident when it comes to soldering. I studied this mod very carefully and conducted it only last week. I used Viper John's method, and it works perfectly, although I'm a little unsure about the voltages. I used the exact components shown and soldered them in exactly the same places. After booting successfully I tested voltages while sitting idle in windows, and it shows the following:

Vmem: 2.165, Vcore: 1.285

From what i've seen im happy with the mem voltage, which is around what everyone else has from what ive seen on many forums. But everyone is talking about a core voltage of 1.4 @ stock. I'm not even getting 1.3v. Are ppl talking about voltage while the card is running a 3d app? or when idle in windows? Just to clear up a few things... Sorry for the n00b questions as I'm unsure and dont really want to fry it if i dont have to. Any feedback would be appreciated.

Thanks
Mark

[persivore]

Hello to all, this is my very first post! I have a quick question in relation to my XFX 7800GTX. I have never completed a vmod on any piece of hardware until this card. I am a very keen and avid computer user, also a computer technition, and are confident when it comes to soldering. I studied this mod very carefully and conducted it only last week. I used Viper John's method, and it works perfectly, although I'm a little unsure about the voltages. I used the exact components shown and soldered them in exactly the same places. After booting successfully I tested voltages while sitting idle in windows, and it shows the following:

Vmem: 2.165, Vcore: 1.285

From what i've seen im happy with the mem voltage, which is around what everyone else has from what ive seen on many forums. But everyone is talking about a core voltage of 1.4 @ stock. I'm not even getting 1.3v. Are ppl talking about voltage while the card is running a 3d app? or when idle in windows? Just to clear up a few things... Sorry for the n00b questions as I'm unsure and dont really want to fry it if i dont have to. Any feedback would be appreciated.

Thanks
Mark

on the 7800GTX's the stock 2d voltage is 1.2v and the 3d voltage is 1.4v. Your Vgpu should increase to about 1.4v once the card enters 3d mode

[ssg3000]

Ahhh ok I thought it may be something along those lines. So ill just run 3dmark05 and then test the voltage. Sweet.. Thankyou very much for ur help persivore.

Mark

[DesertShooter]

I just did the voltmod

On 1,5v it did 540 instead of 510. But then, 1,52v it just turned off. When i turned it back on, it had artifacts, on the desktop. And it still has.

R.i.p :'( ?

[ViperJohn]

I just did the voltmod

On 1,5v it did 540 instead of 510. But then, 1,52v it just turned off. When i turned it back on, it had artifacts, on the desktop. And it still has.

R.i.p :'( ?

What were you using for GPU cooling???

Viper

[DesertShooter]

Boxed heatsink with 2 80mm fan's.

I monitored the temperature, and it didn't reach the 60 C. (stressed)

[ViperJohn]

Boxed heatsink with 2 80mm fan's.

I monitored the temperature, and it didn't reach the 60 C. (stressed)

Well some cards are just genetically destined at birth to have a short lifespan.

Viper

[cronic]

i just ordered these parts for the volt mod
BOURNS INC. 3296W-1-201 200ohm gpu mod
BOURNS INC. 3296W-1-101 100ohm memory mod
i think these are right for the job. both are 25 turn units. i am going to do the gpu first as i am able to up to 1420 on stock volts. my gpu high 3d load volt is 1.449 and i can get 499. i probably will not go over 1.5 as i am aircooling this unit. if these are not the right parts let me know. thanks for the great work and as always mod at you own risk.

[ViperJohn]

i just ordered these parts for the volt mod
BOURNS INC. 3296W-1-201 200ohm gpu mod
BOURNS INC. 3296W-1-101 100ohm memory mod
i think these are right for the job. both are 25 turn units. i am going to do the gpu first as i am able to up to 1420 on stock volts. my gpu high 3d load volt is 1.449 and i can get 499. i probably will not go over 1.5 as i am aircooling this unit. if these are not the right parts let me know. thanks for the great work and as always mod at you own risk.

NO!!!!!!!!!!!!

That should be a 3296W-1-104 100K for the memory. At 100 ohms all you will have is instant smoke.

Viper

[cronic]

glad i asked then. i'll get the right one one the way. thanks for your help. i'll keep you updated.

[cronic]

ok, i did the gpu volt mod. i set it at 200ohm and reinstalled. system booted up fine. i had 1.27 2d voltage and 1.49 3d load voltage. i decieded to turn the pot (while it was running) and one of the solder joints broke loose. i immediatly turnrd the system off. took the bourns off and reinstalled it. no go. so i had a guy who is an expert solder the unit on and still no go. it reads .013 volts at the gpu voltage read point. have i fried my card? is it fixable? i can add pics if that will help. PLEASE HELP!

[cronic]

anybody want to buy a dead bfg 7800 gtx? 175.00 OBO I stress the obo. let me know

[persivore]

anybody want to buy a dead bfg 7800 gtx? 175.00 OBO I stress the obo. let me know

Sorry to hear about the card , but please don't sell outside of the classifieds

[Ubermann]

It might be able to work again dont give up that fast =)

Is there any other ground point to solder at except that small pad ?

[Dynasty]

anybody want to buy a dead bfg 7800 gtx? 175.00 OBO I stress the obo. let me know

You sure its dead not shorting out ?
I looked at the pic you posted, if you look carefully I wonder if the solder there is making contact possibly causing short. If the card has protection, maybe it would not start up too protect itself from possbile short.
Look at the pic you added, I put red dot right below the area that looks to be shorting out on pcb.

[VoRtAn_MaDgE]

anybody want to buy a dead bfg 7800 gtx? 175.00 OBO I stress the obo. let me know

How about taking off the memories and put on a new 7800gtx? The spot's are there will assume 512mb with no prob ????

[cronic]

How about taking off the memories and put on a new 7800gtx? The spot's are there will assume 512mb with no prob ????

i had not thought about that. would the memory controller see the 512mb. i actually just bought a used 6800 ultra for a steal. i think i will probably use the 6800 until the next gen nivida cards are released. so i will let this 7800 go. the board looked better before i took the pot off and played areound. i looked at it under a scope and it definitly was not shorting. not sure what happened. all i know is i gotta get my rig back up and going. thanks

[cronic]

Cronic next time pay someone to do it.
I myself will mod a card and test it first if it dies anytime while I have it I buy the card. With services around the world like this "not just me" $50-100 for a card to mod u that you pay $600 for is cheap
I can pull like 5 names off the front page of the 3dmark orb who;s cards ive done. doesnt mean these guys or even yourself cant do it, but to have insurance and have it done right is a huge plus in this community which is overclocking.

i agree completlty. the guy who normally does this sort of thing for me was out of town when the parts came in. so dummy me decieded to give it a go.
MISTAKE!.
oh well an expensive lesson learned i guess.

[Dynasty]

Sometimes its good to practice soldering on some old pcb just to get it down packed. Even though I been soldering for years, I still have my sloppy moments and go do some practice runs on an old mobo then do the actual mod. Then again I mod old stuff, just for the fun of it and practice of course.

P.S:Jason I seen some of your mods around and I have to say your very
professional at modding...congrats.

[ViperJohn]

ok, i did the gpu volt mod. i set it at 200ohm and reinstalled. system booted up fine. i had 1.27 2d voltage and 1.49 3d load voltage. i decieded to turn the pot (while it was running) and one of the solder joints broke loose. i immediatly turnrd the system off. took the bourns off and reinstalled it. no go. so i had a guy who is an expert solder the unit on and still no go. it reads .013 volts at the gpu voltage read point. have i fried my card? is it fixable? i can add pics if that will help. PLEASE HELP!

When the pot leg tore away it probably took part of the trace with it. The PCB is probably repairable.

Viper

[Hitman47]

Apology for my very bad English knowledge, but I hopes that you can nevertheless to help me

I likewise put the mass of the measuring points on the mass of the trimmers.
Should so actually function.

Now I have however a prolem:

The measured values of Vcore and Vdimm are not correct.

~ 0.83 Vdimm
~ 0.95 Vcore

If I now to turn on the trimmer, then change nothing on the Vcore. Except that a Vdimm is suddenly selected of ~ 0.01. Circuit analyzer and cable ok. Where does the problem lie and/or where am I to ground the measuring points?

I have worked exactly after the guidance of Viperjohn.

[ViperJohn]

Apology for my very bad English knowledge, but I hopes that you can nevertheless to help me

I likewise put the mass of the measuring points on the mass of the trimmers.
Should so actually function.

Now I have however a prolem:

The measured values of Vcore and Vdimm are not correct.

~ 0.83 Vdimm
~ 0.95 Vcore

If I now to the trimmer turn change as well as nothing. Except that a Vdimm is suddenly selected of ~ 0.01. Circuit analyzer and cable ok. Where does the problem lie and/or where am I to ground the measuring points?

I have worked exactly after the guidance of Viperjohn.

In circuit measured resistances are meaningless and if the PWA's traces are damages (open or bridges) that makes it even less usable.

Viper

[Hitman47]

Its mean that my graphiccard is damaged?

With you the measurement with the circuit analyzer folds?