A few voltage questions on the 6800

I had a few voltage questions on the Nvidia 6800 graphic cards. If someone could be kind enough to answer.

1st) Does the voltage remain constant on the Nvidia 6800, no matter what? Is it the same voltage when at 2D and 3D? I heard that it was the same voltage all the time, is that true? What about when "throttling" the card, does the video card decrease the voltage when it needs to throttle the card?

2nd) When using Nibitor version 1.6a to edit your BIOS, should you set all voltages to the same number? For example, set all to 1.4 volts? Or should you set them to different numbers for the 2D, 3D and throttle?

3rd) On my card I had increased the core voltage to 1.4 volts. When you increase the core voltage using a BIOS-mod, then does it also increase the voltage that is being sent to the memory? Or does it only increase the voltage being sent to the core? If it only increases the voltage being sent to the core, then how is it that people get higher memory speeds when using a card with a BIOS-modded-voltage?

Could someone please answer these voltage questions.

Thankyou,
Bitpower

 

From what I have read is that nv41 will have throttle to go up and down and the nv40 has fixed volts. Now from what I have seen in Nibitor v1.6a if you open up a bios you will get the results below.

6800 1.1v2D, 1.2v Thrtl,1.4 3D
6800GT 1.1v2D, Blank Thrtl., 1.3v 3D
6800Ultra 1.1v 2D. 1.3v Thrtl., 1.4v 3D


The right thing to do is what we all would like to know. My opinion is that we need a real good program to edit these bios with. This Nibitor seems a little lacking in features. It doesn't have full control for a critical proceedure that we face. Memory timing is very important and there is no way to adjust it at this time.

 

1st) the voltage remains constant. it has been measured with multimeter.
2nd) it depends on the card and its referenced voltage on the performance table. for example, mine: when i look in vga bios information i get this:
$ffffffffff NVIDIA VGA BIOS information
$ffffffffff ---------------------------------------------------
$1100000000 Title : NVIDIA Geforce 6800 VBIOS
$1100000002 Version : 5.40.02.12.01
$1100000001 BMP version : 5.28
$1100000100 BIT version : 1.00
$1100010000 Perf. level 0 : 350MHz/400MHz/1.20V
$1100020000 VID bitmask : 00000011b
$1100020100 Voltage level 0 : 1.10V, VID 00000000b
$1100020101 Voltage level 1 : 1.40V, VID 00000010b
$1100020102 Voltage level 2 : 1.40V, VID 00000010b
$1100000003 SW masked units : none
so my referenced voltage in performance table is 1.2v. when editing the bios with NiBiToR 1.6 i looked for the 1.2v, which was the Throttle voltage. i had three values, 2D 1.1 ; Throttle 1.2 and 3D 1.4...so i changed the throttle value to 1.4, flashed my board and now it is @ 1.4v (you can see i changed it, the voltage level 1 was 1.20V before flashing). this is a little shortcut to change the voltages, cause what would be nice would be to be able to change the referenced voltage in the performance table. but it is not. so we just have to change the value of the referenced voltage in the VOLTAGE TABLE (this the nibitor allows) so that when bios scans for the referenced voltage it doesn't find 1.2v so goes for the closer value (in this case 1.4v). these values vary for the GT and Ultra (1.3v and 1.4v referenced voltage in performance table, respectively), in nibitor you just have to change the value=referenced voltage.

3rd) i'm not sure about this one, but i think it only affects the core, and ppl having higher overclocks with voltage-modded-bios doesn't make any sense to me.
greetz, peace

 

Re: Re: A few voltage questions on the 6800

It still doesn't make sense to me WHY PEOPLE ONLY CHANGE **ONE** VOLTAGE?

From everything you wrote above, it seems logical that changing all three voltages will have exactly the same effect as if I only edit one voltage. So why not just edit all three voltages to whatever number you want?

Yeah, it doesn't make sense to me either why when increasing the core voltage that you also get a better memory overclock. Anyone know the reason why higher memory overclock, if you only increasing voltage on core? Shouldn't it only give you a higher core overclock?

Sincerely,
Bitpower

 

just place them all on 1.5, who cares

 

Re: Re: Re: A few voltage questions on the 6800

this will work as well. but why edit the three voltages if you can have the same result by editing just one?

 

Yes ... wise one ... Can you tell me how to acheive 1.3v with a 6800nu ????

 

What is the limit that is holding us back from 1.3v? Is there hardware that is causing the limit or is it just a flaw in the bios editing program not being 100% functional with nv40s?

 

read RT faq. it's thouroughly explained there.

 

What does RivaTuner Faq have to do with Bios editing? We were talking about NiBiTor 1.6a and the selection to set a 6800nu to 1.3v that does not exist.

 

had you read the RT faq and you wouldn't be asking these questions. it's explained in the faq why the only possible voltages are 1.1,1.2, 1.4 and 1.5 for performance mode.

 

Read the who thing about 3 times and I didn't see what your talking about... Why don't you just explain?

 

Understand?

 

OK I get it ... What would happen If I did 1.4v ??? My card has a reference cooler. Would it get too hot?

Would more voltage fix my slight glitches with benchmark 3dmark03???

(I am getting on trolls lair and mother nature very slight texture jumping in spots.) NOT black triangle or spots. But ground will have a texture that will be like gittery. Like on Vietcong one of the walls will have a spot that will gitter a bit. Do 12x1 6vp and go back to the wall and it is fine.

You will not believe but 3dmark05 and Doom 3 look perfect with 16x1 6vp enabled... No Crap... I REALLY LOOK CLOSE and there is nothing but perfection.

Will a voltage increase help me...??????????

 

It might. Normally though your core voltage is allready at 1.4V (in 3D mode), so only 1.5V is next. You can try this (via bios flash), see if it changed anything at all, then check your GPU temperature, and if all is well, you can keep the setting.

If it didn't change a thing (except for GPU temperature), change back to the original settings, because then you'll just have to live with the few "jitters" (or play in 12x1 mode); there's no need to overpower your GPU if it does what it's supposed to do/can do.

If it throttles at this voltage, it might help increasing the throttle voltage a tick, but try to steer clear from this one, since it's a safety-net for your card, and throttling is not supposed to happen anyway.

 

ABSOLUTELY WRONG !!!!!!!!! Do some reading.

6800nu= 1.2v constant voltage with no throttle

6800GT= 1.3v constant voltage with no throttle

6800U = 1.4v constant voltage with no throttle


If you don't believe me use a volt meter and you will see....

 

damn, it still confusing, on the dutch forum people are stil talking about biosvoltmods... (changing the 3d tap to 1.5...)

But the only biosvoltmod (on a 6800LE) you can do is flashing a NU into a LE.. (1.1 -> 1.2) or a 6800GT that runs at (asus v9999gt has ddr1 ram, we have that bios ) 1.4v...

Correct?

But still, it doesn't make any difference, i cannot increase gpu-core with a 1.4 bios.. (v9999gt) 420 is the maximum i can run stable... with a 1.2v or 1.4... no difference, is there a theory for?