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VRMtool - a simple tool to read and write to I2C VRM controllers

post #1 of 79
Thread Starter 
VRMtool 0.04 (2016-07-17)
To simplify poking around in I2C registers I wrote a simple tool to dump and modify the I2C registers of VRM controllers connected to AMD/ATI cards. This now evolved into a handy tool to control many aspects of supported VRM chips.

Currently I only have the RX 480 reference card to test and as such only for the IR3567B the tool is able to interpret and change some of the PMBus commands and I2C registers. Additional information about registers of this and other voltage controller chips are very welcome.

Special thanks go to elmor for helping with the IR3567B PMBus commands.

The tool makes intense use of the I2C bus while it is running so you will likely notice microstutters in 3d games/benchmarks. A future version will allow to start/stop live monitoring to allow benchmark runs without needing to close the tool.

RX 480 + IR3567B specific support
  • live graphs for temperature, output voltage, output current and input power
  • override VID
  • change voltage offset
  • change output current scaling
  • phase load balancing/gain (move more/less load to PCIe 6pin)
  • enable/disable load line
  • change load line slope
  • change VRM PWM frequency


Changelog
v0.04
  • live graphs for temperature, output voltage, output current and input power
  • added controls to override VID, add a voltage offset, change output current scaling, phase load balancing (move more load to PCIe 6pin), load line enable/disable + slope, VRM PWM frequency
v0.03
  • minor bugfixes including not uploading the debug version

DISCLAIMER: I take no responsibility at all. I can not be held responsible. Everything you do is on your own risk.




VRMtool004.zip 72k .zip file
Edited by deeper-blue - 7/18/16 at 9:54am
post #2 of 79
Promising start...
post #3 of 79
Thread Starter 
Just uploaded a newer version (0.02) which is more informative about the analysed registers of the IR3567B and how to modify them. It now also includes reading of the output current scaling register that derBauer changed with the eVc to cheat the GPU into thinking it consumes less power than it does. This means with this tool one can do the same thing without owning and soldering an eVc to the board.
post #4 of 79
prepare for the newbies to blow their cards with that cheat.

lol
post #5 of 79
zip is missing files or wasn't compiled correctly
throwing runtime errors
post #6 of 79
Thread Starter 
Quote:
Originally Posted by rjc862003 View Post

zip is missing files or wasn't compiled correctly
throwing runtime errors
The zip should only contain a single exe. If you tell me the exact errors and your graphics card(s) I should be able to help you. It might be that you're just missing the MS C++ redistributable package.
post #7 of 79


I've tried reinstalling all my C++ redistributables, I'm using an EVGA GTX 780 FTW.
post #8 of 79
Thread Starter 
Quote:
Originally Posted by ndunnett View Post



I've tried reinstalling all my C++ redistributables, I'm using an EVGA GTX 780 FTW.

Ok, I will see to that. I either bundle the MFC libs or statically link them but that still doesn't solve the problem that you're using an Nvidia card and are trying to use a tool from the ATI/AMD overclocking section - it only works with AMD cards atm.
post #9 of 79
Woops, sorry! I didn't even realise. I found this thread via google after having trouble applying the volt mod manually.
post #10 of 79
Thread Starter 
Quote:
Originally Posted by ndunnett View Post

Woops, sorry! I didn't even realise. I found this thread via google after having trouble applying the volt mod manually.
Sorry to disappoint! Maybe I will add nvidia card compatibility at one point...

For everybody else: I just uploaded v0.03 it's basically just a fix such that it only requires the standard MFC libraries and not the debug ones.
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