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A temporary fix for the excess PCI-E slot power draw for the reference RX 480 cards - Page 14

post #131 of 178

der8auer explain how to OCed RX-480 and the 6 power connector for RX 480 in bottom video
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lucky Vishera
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post #132 of 178
Thread Starter 
Quote:
Originally Posted by rjc862003 View Post

might be nice to include it so we can manipulate the bias as needed

Unfortunately that's not possible with this tool. Building a similar, highly advanced custom I2C control interface such as Afterburner has isn't exactly easy.

I'm working a permanent fix now, which can be applied by using a loader bios. The loader bios is flashed to the card once and the system will be rebooted. The display driver will not load, since the bios signature will be broken due modifications to the bios code but that's not a problem. Basically the loader bios is used just once and then it will be immediately replaced with the original bios, the card was shipped with. After that the fix is always enabled automatically when the card boots up and 3rd party tools is required beyond that point. Obviously it is compatible with multiple adapters and other OSs (like Linux too).

Applying the permanent fix would not cause any compability issues with the potential fixes AMD might be releasing in the future. The changes can ALWAYS be overwritten or even removed completely.

typer.gif
post #133 of 178
Thread Starter 
Quote:
Originally Posted by nX3NTY View Post

I got a silly question to ask, if I mod the card by removing the capacitor that connect to PCIe power and then tap the positive side of the 6-pin power capacitor and solder it to negative side of former PCIe power, will it work? Image below is the illustrated


No, you certainly don't want to remove any of the input bulk capacitors.



Look at the picture. Above the smaller part of the PCI-E slot connector you'll see two large "000" marked SMD resistors (R450 & R451). Measure if A) both of the resistors are shorted together, B) if they are shorted with the drains of phase 4 - 6 high-side fets (Q510, Q507, Q515). The phase 4-6 high-side fets are the lower three fets in the region shaded in green, and the drains is the part marked with a blue line. If both A) and B) are true, you can try to remove R450 & R451 resistors from the board.

After that you need to measure that upper pad of the resistors you just removed is no longer connected to the 12V pins in the PCI-E connector (shaded in orange). If there is no connection, then you can solder 16-18AWG wire to the upper pads of resistors R450 & R451 and feed 12V directly from the PSU on these. The empty DVI connector PCB mounting holes should provide you a nice ground.
Edited by The Stilt - 7/7/16 at 3:36am
post #134 of 178
eh id rather just use set-on boot then mess with bios modding its way to risky at this stage


load tool on startup is all you need

kind of wish afterburner had a apply on startup field for the IC2 interface

tho I would guess msi-ab will have this override soon enough
Edited by rjc862003 - 7/7/16 at 8:14am
post #135 of 178
Quote:
Originally Posted by rjc862003 View Post

eh id rather just use set-on boot then mess with bios modding its way to risky at this stage


load tool on startup is all you need

kind of wish afterburner had a apply on startup field for the IC2 interface

tho I would guess msi-ab will have this override soon enough

Creating a batch script to run the commands at boot should be pretty simple (for Windows, obviously).

Just use the task manager to create a new task to launch at boot with administrative rights. The batch file will need to elevate its rights, probably, which isn't that difficult.

Using my super-simple printer-purge batch file as a template would probably make things easier.

http://files.looncraz.net/FixPrinting.bat.txt

I can't claim responsibility for the privileges code, I downloaded that a long time ago and never intended to share the batch file, so I didn't put any attribution information in it.
post #136 of 178
Thread Starter 
I can apply the fix permanently via Afterburner, however before releasing any permanent solution, I would like to see what AMD comes up with. I have a reason to believe that 'AMD's solution' is almost the same, if not exactly the same as mine in terms of the values used wink.gif
Edited by The Stilt - 7/7/16 at 11:04am
post #137 of 178
already done all that I just figured having all the tweaks in one place would make sense
and knowing unwinder he will get to it ...eventually
post #138 of 178
Thread Starter 
Ok, now that the 16.7.1 driver is out, can someone check which numbers AMD is using?

Without manually applying the fix, obviously.

- "MSIAfterburner /ri06,08,1E"
- "MSIAfterburner /ri06,08,1F"

The response is followed by a colon [:].
post #139 of 178
I don't have a RX480 on hand yet because nobody seems to have stock but the
total reduction is about 10W so I am assuming they are using the bare minimum
post #140 of 178
maybe just dump whole VRM controller memory before and after driver?
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