Gigabyte 5870 SOC

[miahallen]

Please use the following mods at your own risk. Nobody here is responsible for damages done!
Credit to BenchZowner for the mods here....thanks Bill

Simple FB mod: ( corrected!)



Measure the resistance between the circled resistor and a ground and connect a VR ( trimmer ) 20 times the resistance measured.

VID mod:

Check the VRD11 codes for the On Semiconductor ADP4100 from the PDF - http://ceemic.pri.ee/hardware/datasheets/ADP4100.pdf [ nice library Ceemic ]
And move the resistors to the proper locations ( logic high (1) or logic low (0) ).
Logic high = front side of the card
Logic low = rear side of the card

photos:

VID Low ( 0 ) - rear side


VID High ( 1 ) - front side


You have 7 resistors, you have to place 1 resistor for each VID bit ( VID0, VID1, VID2, VID3, VID4, VID5, VID6, VID7 ) to High ( 1 ) or Low ( 0 ) depending on the voltage you want to apply ( according to the ADP4100 datasheet ).
If you leave a spot open ( not connected via a resistor ) on both Low & High it will be considered as Low ( 0 ) by the PWM controller.

OCP Mod:



You can mod the card ( add a LED ) to monitor OCP, or use an oscilloscope
If OCP/OVP kick in your GPU's voltage should be 0.3x after it crashes or hangs.

Application - 5870 SOC Tuner beta:

http://www.benchzone.com/Downloads/T...70socTuner.rar

WORKS FINE FOR E.S. cards
FOR RETAIL CARDS GPU Core Voltage ( Vgpu ) DOES NOT work
The other voltages ( Vmem, Vpcie, Vddci ) WORK FINE WITH BOTH retail and E.S. cards.

[boblemagnifique]

Software SOC Tuner ^^

[[XC] gomeler]

Software SOC Tuner ^^

[DEVIL K-ce]

For retail card We are limited to almost 1.3v on gpu :/

[BenchZowner]

Simple FB mod: ( corrected!)



Measure the resistance between the circled resistor and a ground and connect a VR ( trimmer ) 20 times the resistance measured.

VID mod:

Check the VRD11 codes for the On Semiconductor ADP4100 from the PDF - http://ceemic.pri.ee/hardware/datasheets/ADP4100.pdf [ nice library Ceemic ]
And move the resistors to the proper locations ( logic high (1) or logic low (0) ).
Logic high = front side of the card
Logic low = rear side of the card

photos:

VID Low ( 0 ) - rear side



VID High ( 1 ) - front side


You have 7 resistors, you have to place 1 resistor for each VID bit ( VID0, VID1, VID2, VID3, VID4, VID5, VID6, VID7 ) to High ( 1 ) or Low ( 0 ) depending on the voltage you want to apply ( according to the ADP4100 datasheet ).
If you leave a spot open ( not connected via a resistor ) on both Low & High it will be considered as Low ( 0 ) by the PWM controller.

Application - 5870 SOC Tuner beta:

http://www.benchzone.com/Downloads/T...70socTuner.rar

WORKS FINE FOR E.S. cards
FOR RETAIL CARDS GPU Core Voltage ( Vgpu ) DOES NOT work
The other voltages ( Vmem, Vpcie, Vddci ) WORK FINE WITH BOTH retail and E.S. cards.

[BenchZowner]

Sorry made an oops before, corrected the simple FB mod.

[miahallen]

Thanks BZ....what's the advantage of the VID mod? Does it get rid of OCP?

OC Guru seems to be working alright for me (including vGPU).
But I need to use DMM for manual voltage monitoring to be sure.

[AndreYang]

pm me.

[BenchZowner]

Thanks BZ....what's the advantage of the VID mod? Does it get rid of OCP?

VID mode overrides OVP ( Over-Voltage Protection ).

OCP needs to be done regardless of how you mod your card ( if you get it to kick in, don't know if it's necessary )

[ waiting for a front photo to complete the VID mod guide ]

[miahallen]

[ waiting for a front photo to complete the VID mod guide ]

Give me about 20 minutes

[BenchZowner]

Take your time

[miahallen]

Thanks Bill

[BenchZowner]

Thanks miah.
Post edited, both mods are complete and kind of explained ( in short ) now

[Jor3lBR]

Can anyone confirm if my line of thought is right:

If I want 1.55vgpu all I need to do is move VID6 R858 (high) to VID6 R859 (low) and VID3
R5253 (low) to VID3 R5246 (high) = 1.55vgpu?

[Raja@ASUS]

Can anyone confirm if my line of thought is right:

If I want 1.55vgpu all I need to do is move VID6 R858 (high) to VID6 R859 (low) and VID3
R5253 (low) to VID3 R5246 (high) = 1.55vgpu?

The only two resistors you need high for 1.55 VGPU are 3 and 1, so if all others are low that is correct (leaving pins open results in them being pulled low anyway).

You are right to choose the VID mods rather than screwing with FB pin mods. Error amp gain is set by an RC combo which will be affected and end up quite nasty in some instances (feedback can go positive).

[miahallen]

OK.....I did VID mod for 1.55V and I'm getting 1.6V actual. But it seems to be running fine at -100C right now.

[BenchZowner]

Yeah, what I forgot to mention is that huge overvoltage.
Check for coldbug temp miah, and get ready for another mod if it's bugging low

My stupid sample artifacted after a few seconds of running at 1.4V ( modded for 1.35V... :@ ) on air, and never came back to life ( keeps artifacting no matter what grrrrr )

[BenchZowner]

Yeah, what I forgot to mention is that huge overvoltage.
Check for coldbug temp miah, and get ready for another mod if it's bugging low

My stupid sample artifacted after a few seconds of running at 1.4V ( modded for 1.35V... :@ ) on air, and never came back to life ( keeps artifacting no matter what grrrrr )

[miahallen]

Took her down to -160C once and black screened on me....I'm pretty sure it was CB
Testing with Vantage right now, but it doesn't wasnt to run at more than 1250MHz
Testing at -80-90C now....

How can I monitor for OCP?

I may be bugging low

[miahallen]

Yup....definitly CB around -160C

[BenchZowner]

OCP Mod:



You can mod the card ( add a LED ) to monitor OCP, or use an oscilloscope
If OCP/OVP kick in your GPU's voltage should be 0.3x after it crashes or hangs.

[BenchZowner]

You can try disconnecting the TTsen pin ( temp sensor ) to see if you can get the CB temperature lower.

[miahallen]

Well....I'm about done for today. Not too please with the results
Passed Vantage @ 1300/1300 but only with slow CPU (i5 670 @ stock), once I OCed the CPU (pushed the GPU a little harder?) the GPU would fail at 1300
It was doing fine at 1250MHz at -70C...but dropping temps all the way down to -150C wouldn't get me through at 1300....

I'm thinking I will VID mod again for sloightly less voltage, maybe I'm overdriving it? Based on the symptoms you describ, I'm not hitting OCP, so that's good. But somethings not right....or this GPU just sucks....I'll try again tomorrow

Thanks again for the help Bill

edit - OP updated

[G H Z]

I wouldn't do a VID mod until you've tested the card, no way to know if 1.6V is the sweet spot.

[miahallen]

Yeah....a bit of trial and error really

After the VID mod, the OC Guru SW will still allow an extra 0.2V so I could have tried up to 1.8V via the SW (but I didn't )
I think I'll change to a 1.4V VID tomorrow and use SW to find the sweet spot between 1.4-1.6V