GIGABYTE Radeon 7970 TO Rev1.0 (GV-R797TO-3GD) mod guide

[Massman]

Just found this forwarded to my email. Figured I could share.

 

Card: GIGABYTE GV-R797TO-3GD

 

Guide

 

 

1) For LN2 GPU, you need to use blade to pop up the shim like picture says.

 

 

2) Remove the resistor for unlock the voltage limitation including vGPU and vGDDR

 

3) Please the atiflash to upgrade a new OC bios which name "R797TO3D_OC"

 

Bios download: http://downloads.HWBOT.org/downloads/VGABIOS/R797TO3D_OC

 

Improved OC in BIOS

 

a. Force PCIe to Gen2 mode to make compatible with BCLK overclocking and -120C temp issue

b. Disable UVP, UTP, OVP, OTP and OV

c. Disable Sleep mode when CFX

d. Unlock frequency limitation to 2000/2200 in C.C.C

e. VGPU tested 1.80V, VGDDR test 2.0V

 

4a) Use the OV tool to adjust VRM and voltages., double click R797TO.exe to open the tool. (tool[/url] not public)

 

4b) Download CHL8228 datasheet, find VSEN pin and use VR to overclock.

 

Good luck!

Edited May 8, 2013 by Massman

[Moose83]

Wow i have this card, really thanks for sharing!

[crustytheclown]

whre can we get the tool Peter?

Thanks for sharing

[Massman]

The tool is to advanced to be public. It can change VRM frequency (too high = fire) and 1.9V Vgpu and 2.0V Vmem. If you remove the resistor and then find pin for Vsen, you can just use a VR to control the voltage to any level. BIOS takes care of OCP and all that stuff.

[crustytheclown]

That's great to hear,i was wondering why we need the mod but thanks for clearing it out...

This card should be a very interesting choice...

[Moose83]

Does afterburner allow to overvolt the card to 1,8V without the resistor?

And only flash the BIOS does disable all protections?

Edited November 28, 2012 by Moose83

[Massman]

Not sure - just hardmod, it's very easy.

[Moose83]

And flashing your BIOS disable all protections?

[Massman]

Yes. You just need to flash the BIOS + remove the resistor to unlock full voltage range

 

Improved OC in BIOS

 

a. Force PCIe to Gen2 mode to make compatible with BCLK overclocking and -120C temp issue

b. Disable UVP, UTP, OVP, OTP and OV

c. Disable Sleep mode when CFX

d. Unlock frequency limitation to 2000/2200 in C.C.C

e. VGPU tested 1.80V, VGDDR test 2.0V

 

UVP = undervoltage protection

UTP = undertemperature protection

OVP = overvoltage protection

 

etc ...

[Moose83]

I have the 1GHz Version of this card, does it work too? Pcb looks the same:)

[Moose83]

Well i flashed the bios, but now i cant boot the card, get bluescreen with ati error

[Massman]

I'll check with GBT tomorrow morning (~ in 9h)

[Moose83]

Shortly one time i was able to boot:) GPU-Z shows pcie 2.0, before 1.1, so seems like some parts work. But Win hasnt load the driver and gives an error. Clocks in bios are 1100/1500, maybee this is the problem.

[Massman]

Yeah - might be. What about the Vgpu?

[Moose83]

Vgpu i removed the resistor, but only tested with afterburner and it didnt work there, so hardmod is needed.

Maybee the bios is for the superclocked? Tested some other Bioses from Techpowerup, all Bioses work, but superclock Bioses didnt work.

I have the 1GHz Ocerclocked Version of this card.

Can you ask Gigabyte for the other Bioses please

[Massman]

No, the BIOS is for sure for the GV-R797TO-3GD card .

 

I mean - what is the Vgpu now at? What driver/os are you trying?

[Moose83]

http://www.gigabyte.com/products/product-page.aspx?pid=4102#ov

 

Thats my card, same as your linked Card, only clocks are a bit differened;)

The Bios increase the Volt a bit, not that much, but still in Afterburner 1,3V maximum.

I use Win 7 with the newest driver 12.11.

But my card cant boot with that bios, get ATI error on Bluescreen, also the bios is only 64kB, original is 128kB.

[Massman]

Bios size is not the problem. It's probably going to be Vgpu or so. Let's try to figure out what the problem is.

 

If you change to the backup BIOS (bios switch), can you then install the driver without any problem?

[Moose83]

Yes BIOS 2 works without Problems:)

I tryed to delete all ATI drivers flash then the card and install drivers. Install no problem but After reboot same driver issue again.

[Massman]

Hm.

 

Did you try flashing the BIOS again? Maybe something didn't go entirely correct during the flash. Try this Atiflash version: http://downloads.hwbot.org/downloads/tools/atiflash.exe

[Moose83]

Tryed many times;)

I use atiflash -f -p 0 biosname.rom

I will try with your atiflash again;)

 

Same again, it wont work:(

Edited November 30, 2012 by Moose83

[04ahgy]

Tryed many times;)

I use atiflash -f -p 0 biosname.rom

I will try with your atiflash again;)

 

Same again, it wont work:(

 

Because your card does not use the same VRM. Mine uses different chip from CHiL CHL8228G. BIOS structure also differs from the GV-R797TO-3GD, and the BIOS submitted is not intended to use on your card.

 

HGyu

[Moose83]

Mh, damn:(

Is there an way like this for my card:)

[Alex@ro]

Because your card does not use the same VRM. Mine uses different chip from CHiL CHL8228G. BIOS structure also differs from the GV-R797TO-3GD, and the BIOS submitted is not intended to use on your card.

 

HGyu

 

what vrm does the non overclocked variant have?

[Atlas Rush]

Bumping this thread, since the pictures in the first post disappeared, and I was finishing the procedure this evening...Flashed the bios correctly (but the card is not stable), I need the second picture in order to remove the resistor and unlock voltages...moreover, Massman, is the tool still under NDA or is it public?