6800 Ultra Cold Bug.

[{PMS}fishy]

Well I strapped a r404a Mach I onto my 6800, and the temps read 10c in rivatuner, and the evap was at -49c. Figured that something had to be up with that, I tried to change clock settings, the computer would lock, anything other than 2D and the computer would lock, screen would go all crazy. I take it that is the card freaking out because the temps are so low.

Anyways, anyone have a work around for this, or a modded BIOS, or can you point me in the right dirrection?

I need to knock some of those x850 scores out of the top 10 for non-SLI.

[blinky]

a delta of 59c screams of bad contact

that is... if the rivatuner reading is correct
should be around -15 to -20

[kraggy]

I sure hope there isn't a 6800-U cold bug. I have someone making me a phase-change SLI cooler. This would SUCK way bad.

[{PMS}fishy]

a delta of 59c screams of bad contact

that is... if the rivatuner reading is correct
should be around -15 to -20

Thats the thing, I don't know if its reading it right. The contact looks good, there is a nice imprint on the evap.

I even tried with my 172w TEC and water block, and it still read 10c.

I wonder if it stops reading bellow a certain point.

I figured out the frozen screen. I bumped my volt mod and knocked it off, oops.

[{PMS}fishy]

I sure hope there isn't a 6800-U cold bug. I have someone making me a phase-change SLI cooler. This would SUCK way bad.

There deffinatly is a cold bug. Some cards have it, some don't. Which is what Im trying to figure out.

[kraggy]

There deffinatly is a cold bug. Some cards have it, some don't. Which is what Im trying to figure out.

So the cold bug is just temp readings? The frozen screen was your damaged v-mod, right? Or is the cold bug both?

[mr_knowitall15]

ive read that the temperature readings are really buggy and innacurate, i have seen this by seeing different temps just from getting new drivers, they all report it differently.

[Apocalipsis]

On 6800 cards anything below 25º core temp makes the cold bug to appear.

This cold bug prevents you to overclock the card due to it thinks that the temperature is too high and throttles to stock settings, sometimes doing strange things like yours.

To avoid this problem you can try Rivatuner and set Constant Performance level to Performance 3D under the overclocking tab. This sometimes works and others dont.

The safe way to prevent this is to edit the bios on your cards to set the same frequency for 2D and 3D speeds, extract the bios with nvflash, edit with Nibitor and reflash with nvflash again.

Dont worry about temps, I'm using dryice on mine and it reads 2º, crappy sensors.

[Kunaak]

the cold bug has been around for a long time now.
check our bios area, for a thread by Shamino.
we been looking for a way around it for a long time now...
theres no real work around for it.

only asus cards seem to have no cold bug, but thats cause they use a totally different temp system for thier cards that read both ram and GPU Clock.

[Apocalipsis]

theres no real work around for it.


Editing the bios to match 2D and 3D speeds the same actually works.

[dpa]

I have 1 POV 6800 and no cold bug here with my Mach II r404a mounted on it, the sensor stays at 10C no matter what I do, so you can just ignore it.

[{PMS}fishy]

the sensor stays at 10C no matter what I do, so you can just ignore it.

Thats good to know. So I must be getting good contact like I thought.

[{PMS}fishy]

Editing the bios to match 2D and 3D speeds the same actually works.

Ill give that a shot and see what happens.

Now to find the max clock speeds ;)

[{PMS}fishy]

So the cold bug is just temp readings? The frozen screen was your damaged v-mod, right? Or is the cold bug both?

I think its a little of both. Im going to repair the mod, remount the mach, and flash the BIOS.

Ill let you guys know in a few hours.

[kraggy]

I think its a little of both. Im going to repair the mod, remount the mach, and flash the BIOS.

Ill let you guys know in a few hours.

What make is your 6800?
I wont' get my phase cooler for a couple a weeks and I can't get my DFI nf4 sli-dr to boot from my floppy so I'm gonna have to try to boot from my flash drive if I can.

@ Apocalipsis...
It doesnt' matter what the clocks are, just as long as they are the same in 2d & 3d?

[uclajd]

I'd like a confirmation on this. I've used the bios hack for above zero, but not sub. I'd like to try my 6800 at -85C...

[{PMS}fishy]

What make is your 6800?
I wont' get my phase cooler for a couple a weeks and I can't get my DFI nf4 sli-dr to boot from my floppy so I'm gonna have to try to boot from my flash drive if I can.

@ Apocalipsis...
It doesnt' matter what the clocks are, just as long as they are the same in 2d & 3d?

Its an eVGA, its also AGP. I think the PCI-e ones respond differently to cold.

[{PMS}fishy]

Well long the way something terrible went wrong. Minus 1 6800 Ultra.

I had perfect contact, the voltage was set correctly on the card, I booted up, all was well, the drivers go to load and the computer shuts down. It continued to do this a few times, and everything was fine before the drivers, even in safe mode everything was perfect.

I take the phase off, flash the card back to 1.4v pop on the stock cooling, and fire it up, now my screen is all scrambeled. I get white lines though the text as well as red dots. Im going to tinker around with it somemore, but it looks like this card hasa kicked the bucket.

[mtb856]

Wow, that's a bummer...... sorry man :(

[{PMS}fishy]

With no drivers loaded 2D works fine. I don't get it. When posting, I still get the red lines and junk, but it all goes away in safe mode, or with out drivers. Its perfect from what I can tell.

I tried flashing the card a bunch of times. This card is really weird, when flashed to 1.3v I read 1.6v off the card. 1.4v and 1.5v are fine though.

Anyone have an idea why the BIOS would be all scrambeled but windows with no drivers is fine?

Also if someone could send me a working BIOS file with ultra clocks, that would be great.

[drcrawn]

when flashed to 1.3v I read 1.6v off the card.


Thats actually kinda cool! 1.6v would be the highest vgpu hit with only a BIOS mod I think... Wonder if that can be repeated for anyone with a 6800U... If you could hit 1.6v by selecting 1.3v, makes a hard mod sorta unnecessary :)

[{PMS}fishy]

Thats actually kinda cool! 1.6v would be the highest vgpu hit with only a BIOS mod I think... Wonder if that can be repeated for anyone with a 6800U... If you could hit 1.6v by selecting 1.3v, makes a hard mod sorta unnecessary :)

Unless you want 1.7v ;)

This is killing me. I don't understand why it works fine in 2d with no drivers but I can't load drivers, and why the post screen in BIOS is all fubar.

[andL64]

yeah i know what happend u know.

u ve done the vmod and set in bios 1,4V but when u start windows u get drivers loaded and add +0,15-0,2V on the setted core voltage in bios so if ya setted to 1,5 with vmod u actually got 1,72or something and that killed it.
Because i tried with my mach2 the same and got also ALL your problems, the cold bug is to work around like said be4 flash bios 2D/3D settings the same and dont open any nvidia or rivatuner :banana::banana::banana::banana: do nothing just bench but sometimes (u know it when u enter win) the card is also throttling then u have to reboot until it isnt.
So when i gave my card 1,4Flashed bios and 1,62Loaded i got (as i enter win screen)
The "Display not found" Error on my TFT, so i found out my card cant handle more than 1,52V or it gets no display output!

seEn

PS: sry 4 ur card...

[drcrawn]

I just came across this post @ Guru in the Rivatuner section.

Posted by Unwinder AKA the creator of RT.

"Thermal sensor ICs used on most of 6800s (MAX664x/665x and LM8x) have programmable upper and lower temperature alert limits. Whilst the upper limit is programmed by VGA BIOS to the desired value, lower limit remains unchanged (0 by default). So we've came to the reason of the problem:
The sensor has special ALERT output pin, which is signalled as soon as the temperature goes beyond the range specified with the sensor's programmable upper/lower allert limits. The sensor's ALERT pin is connected to the GPU's GPIO pin (the same pin is used to see if the external power cable is plugged in), so the driver can detect a lack of power / sensor's alert and throttle down the system in this case.

The workarounds I see are:
1) Reprogramming lower alarm limit (e.g. to -100)
2) Disabling lower alarm limit at all (the sensors have programmable mask allowing to disable any limit).

Both things can be easily done at NVIDIA driver level, so there is a hope for fix in future drivers."

http://forums.guru3d.com/showthread.php?s=&threadid=133293[I]

[{PMS}fishy]

yeah i know what happend u know.

u ve done the vmod and set in bios 1,4V but when u start windows u get drivers loaded and add +0,15-0,2V on the setted core voltage in bios so if ya setted to 1,5 with vmod u actually got 1,72or something and that killed it.
Because i tried with my mach2 the same and got also ALL your problems, the cold bug is to work around like said be4 flash bios 2D/3D settings the same and dont open any nvidia or rivatuner :banana::banana::banana::banana: do nothing just bench but sometimes (u know it when u enter win) the card is also throttling then u have to reboot until it isnt.
So when i gave my card 1,4Flashed bios and 1,62Loaded i got (as i enter win screen)
The "Display not found" Error on my TFT, so i found out my card cant handle more than 1,52V or it gets no display output!

seEn

PS: sry 4 ur card...


I have no issues like that. I ran 1.7v on this card fine for months. Thats not what killed it. I also took the mod off, and flashed it back to 1.4v. Again, 1.3v =1.6v for me, and 1.1v just does not work at all, so I have to set 2d and 3d to 1.4v, yet I still get the card to lock when drivers load. Rather the screen just goes black, and prior to that I get the screwed up screens.

As I said, and no one has mentioned anything about this, why is the card screwed up durring the MB post, but perfectly fine once in windows with no drivers? Is it not the exact same situation?

[kraggy]

I just got this PM from sandman001. He is making the SLI phase cooler for me. He said he was able to overcome the 6800 clod bug by using Riva Tuner. He selected the "force this performance" thing.

I hope this helps..... :woot:


I can, through use of a valve instead of cap tube.

However, I had my phase-change system on my 6800NU, and by using rivatuner's "force this performance" thing, I was able to overcome it.

I can make it adjustable, but I can really only tweak it for one temperature range, so I'll probably just mark the valve where to set it for optimum temps, and then you can adjust from there.

[andL64]

ohh so i misunderstood

thats really weird, man
i would say try other drivers if u havent in some cases i got also strange problems with some nvidia drivers. or check mainboard settings again... dunno, u have to find out hard to help.

seEn

[olfen]

@fishy I've had the same problem with my 6800gt, so i throw it in the ground and it worked for a couple of months but now the same thing, so I just threw it in the garbage, NO MORE NVIDIA FOR ME

[LardArse]

I have no issues like that. I ran 1.7v on this card fine for months. Thats not what killed it. I also took the mod off, and flashed it back to 1.4v. Again, 1.3v =1.6v for me, and 1.1v just does not work at all, so I have to set 2d and 3d to 1.4v, yet I still get the card to lock when drivers load. Rather the screen just goes black, and prior to that I get the screwed up screens.

As I said, and no one has mentioned anything about this, why is the card screwed up durring the MB post, but perfectly fine once in windows with no drivers? Is it not the exact same situation?
Heh sounds so deja vuish....
when installing drivers always make sure card is not cold.
firstly try to boot up at ambient temp, wait in windows for temps to
drop slowly. clock her up using rivatuner with the testing disabled. click
save settings at start up.
next time when u boot into windows, the o/c speed will kick in, dont open up
rivatuner at all or any nvidia apps, just run your games or benches. if
there is throttling, reboot and repeat until there is a non throttled
windows boot up. it will stay non throttled until u reboot or open up
rivatuner or any nv programs.
agp cards and some pci express GT cards suffer from this.

[CrimeDog]

Heh sounds so deja vuish....
when installing drivers always make sure card is not cold.
firstly try to boot up at ambient temp, wait in windows for temps to
drop slowly. clock her up using rivatuner with the testing disabled. click
save settings at start up.
next time when u boot into windows, the o/c speed will kick in, dont open up
rivatuner at all or any nvidia apps, just run your games or benches. if
there is throttling, reboot and repeat until there is a non throttled
windows boot up. it will stay non throttled until u reboot or open up
rivatuner or any nv programs.
agp cards and some pci express cards suffer from this.

thank you LardArse! :toast:

btw I have my eye on your 3d01 single 6800u record :D

[LardArse]

thank you LardArse! :toast:

btw I have my eye on your 3d01 single 6800u record :D

Hmmm did I ever have it?? :confused:

[CrimeDog]

well when you search 01 for 6800 ultra your 34886 is on top, that's good enough for me

[{PMS}fishy]

I pretty much give up. The cards dead, well not alive.

No drivers work, only works with no drivers installed. Windows is fine, nothing looks screwed up. I just don't understand this at all.

Oh well, guess its time for a new card.