1,5 Volts with biosmod on 7800gt is possible!

[Dr.Leary]

Those who say that raising vcore on 7800GT not is possible without hardmod are wrong. Havn´t tried on GTX, but i think it will work on them also.

Open your bios with nbitor then change device to 6800series.
Save bios then open it upp again. Now you can use the extended voltage table. After changing to 1,5, change device back to 7800gt. Save.
Flash your card and mesure if you don´t belive me.

[AKRedneck]

What did you set the 2D voltage at? I just opened up the bios editor, went through the sequence, then notice 2D is blank after setting back to 7800GTX..? Did you have to manually set that?

[Dr.Leary]

1,3v

[Slipknot]

€dit: Doesnt work on my GTX 256^^

[Dr.Leary]

What brand? What do you mean by it doesn´t work? Can´t you change to 1,5v in bios or can you change to 1,5 but it still measure 1,4 after flash?
You can change all GTX bioses to 1,5v if you do the steps in the right order

[Pyr0]

this sounds great
can anybody link me to any guides for this please?
how do i get the bios off my card?
sorry for the dumb questions, but i'm a bit of a noob when it comes to flashing video card bios's

[Dr.Leary]

1.make a bootable floppy
2.place nvflash on it
3.reboot
4.write nvflash -b bios.rom

[xtremetheme]

Hi, well it is possible that there is 1.5V setting.
The 7800 cards have an unlabled voltage, which is only selectable in VID Mode as 3 - ?.? The ?.? mean i have no idea what voltage this gives.
All the 7800GTX users which tested this didnt have a mulitmeter to measure the real voltage, but said that their card doesnt oc better, so it was likley to be a lower voltage setting.
The way described changing the card device to 6800 and extending table, does add an entry 3, labled as 1.5V, because it is that way for 6800 cards.
This doesnt mean it really gives 1.5V, you can only see what voltage you get by measuring with multimeter on the card.
The bios 6800 switching way is not optimal, as it makes the other voltage labels incorrect. The 1.3V setting you have after that is in reality 1.4V, and the 1.1V is 1.2V.

A better way for testing would be to use VID mode and set VID 3 for 1.4V, instead of VID 2.
http://img486.imageshack.us/img486/3348/vmod37nh.gif
That way you will still have 1.4V displayed, but get the unknown voltage.

If you are really sure this setting will give you 1.5V, its a nicer way to use the voltage table editor to change the label of 1.4V to 1.5V, and the VID from 2 to 3
http://img486.imageshack.us/my.php?image=vmod11by.gif
http://img486.imageshack.us/my.php?image=vmod24ef.gif

After that you can select the 1.5V with the exact mode and dont get confused which voltage you really set.
http://img486.imageshack.us/img486/690/vmod41wn.gif

Note that displaying the voltage with rivatuner or nibitor does not work for the unknown setting, some has to measure it with hand to really say what voltage it gives.

[Dr.Leary]

Hi, well it is possible that there is 1.5V setting.
The 7800 cards have an unlabled voltage, which is only selectable in VID Mode as 3 - ?.? The ?.? mean i have no idea what voltage this gives.
All the 7800GTX users which tested this didnt have a mulitmeter to measure the real voltage, but said that their card doesnt oc better, so it was likley to be a lower voltage setting.
The way described changing the card device to 6800 and extending table, does add an entry 3, labled as 1.5V, because it is that way for 6800 cards.
This doesnt mean it really gives 1.5V, you can only see what voltage you get by measuring with multimeter on the card.
The bios 6800 switching way is not optimal, as it makes the other voltage labels incorrect. The 1.3V setting you have after that is in reality 1.4V, and the 1.1V is 1.2V.

A better way for testing would be to use VID mode and set VID 3 for 1.4V, instead of VID 2.

Edit: I´m not at all confused
http://img486.imageshack.us/img486/3348/vmod37nh.gif
That way you will still have 1.4V displayed, but get the unknown voltage.

If you are really sure this setting will give you 1.5V, its a nicer way to use the voltage table editor to change the label of 1.4V to 1.5V, and the VID from 2 to 3
http://img486.imageshack.us/my.php?image=vmod11by.gif
http://img486.imageshack.us/my.php?image=vmod24ef.gif

After that you can select the 1.5V with the exact mode and dont get confused which voltage you really set.
http://img486.imageshack.us/img486/690/vmod41wn.gif

Note that displaying the voltage with rivatuner or nibitor does not work for the unknown setting, some has to measure it with hand to really say what voltage it gives.

I have indeed measured with multimeter. I get 1,2v in 2Dmode and 1,5v in 3Dmode. Why is i so hard to belive.

[Pyr0]

i've managed to find the programs nibitor and nv flash, and i even found a bios for my card(not sure if mine will be the same version tho), so i've been playing with that before grabbing the bios from my card and modding it
doing the 7800-6800-7800 mod adds an extra voltage table entry
now i have 4 entries instead of 3, is this correct?

[Dr.Leary]

Yes

[xtremetheme]

I have indeed measured with multimeter. I get 1,2v in 2Dmode and 1,5v in 3Dmode. Why is i so hard to belive.

Hi, yes i belive you as you are the first one to try this with 7800GT.
But from the reports i think it wont work on 7800GTX.

@Pyr0
The association of label and vids are now wrong for 7800GT, you should set it to
1.2V - 0
1.3V - 1
1.4V - 2
1.5V - 3

For the 7800GTX it is
1.2V - 0
1.3V - 2
1.4V - 1
?.?V - 3

You see the scheme between 7800GTX and 7800GT is already different, so VID 3 = 1.5V measured on 7800GT doesnt automatically mean its the same for 7800GTX.

[Pyr0]

so it's not correct then?
Dr.Leary, did you have to change the labels and vid's?

[CruSifiXken.Be]

Hi, yes i belive you as you are the first one to try this with 7800GT.
But from the reports i think it wont work on 7800GTX.

@Pyr0
The association of label and vids are now wrong for 7800GT, you should set it to
1.2V - 0
1.3V - 1
1.4V - 2
1.5V - 3

For the 7800GTX it is
1.2V - 0
1.3V - 2
1.4V - 1
?.?V - 3

You see the scheme between 7800GTX and 7800GT is already different, so VID 3 = 1.5V measured on 7800GT doesnt automatically mean its the same for 7800GTX.

So with these settings, you get 1.5Volt on the core?

[Pyr0]

that's what i'm trying to find out, but i'm getting conflicting advice :S

[xtremetheme]

Nothing is conflicting here, Dr.Leary just tested VID 3 and it gave him 1.5V.
So setting this by either way should give you 1.5V. Its just more nicer to set the other voltages correctly too.

[Pyr0]

so why did Dr.Leary tell me that the screen was right, when it needed correcting?

[xtremetheme]

Because it is right in the term that it gives you vid3=1.5V in 3D.

[Pyr0]

ah, but the other settings undervolt, and so need fixing - gotcha, thanks

[CruSifiXken.Be]

is 1.55V also possible?
Can anyone mesure it with a multimeter?

[Ub3r-L33ch]

Ok.... so is it possible for the GTX's or no? Anyone confirmed this yet?

[Dr.Leary]

Ok.... so is it possible for the GTX's or no? Anyone confirmed this yet?

Why don´t you just try? If it doesn´t work just flash back

[CruSifiXken.Be]

Why don´t you just try? If it doesn´t work just flash back

can you reach 1.55V Leary?

[xtremetheme]

Noone has tested the 7800GTX 512MB yet, it could be it has 1.55V as third option, as it has 1.45V in 3D.

[Striper]

Ok.... so is it possible for the GTX's or no? Anyone confirmed this yet?

this does not work for 7800gtx! more than 1,4V are not possible. tested it with Dr.Leary´s and xtremetheme´s method.