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MSI GeForce RTX 3090 AERO attach point, EVC2SX,uP9512R 

Hello there,

I was wondering if someone could help me with my MSI GeForce RTX 3090 AERO.

Is there any i2c attach points for my EVC2SX ?

Voltage controller: uP9512R

Thanks!

Uploaded files:
  • inside.jpg
  • inside2.jpg
  • outside.jpg
  • outside2.jpg

Hello, I tried to trace the pins from the controllers based on your picture. See the attached image.

Uploaded files:
  • i2c.png
Quote from elmor on 2021-05-02, 08:01

Hello, I tried to trace the pins from the controllers based on your picture. See the attached image.

Thanks for your reply. It works. My EVC2SX has successfully connected to the uP9512R.
I want to control the GPU voltage. But there is no controller like MP2888A can be found on i2c bus. Any suggestions?

Uploaded files:
  • b.jpg
  • ev.PNG

I didn't see any MP2888A controller on that card, so I don't see why you would expect to find one. There seems to be 3x uP9512 so I'm not sure why you're only finding 2x and not 3x of them. One should be for GPU voltage, another for MSVDD and the third one for memory voltage. What is the voltage reading from the uP9512 at address 26 and address 27?

Quote from elmor on 2021-05-03, 09:04

I didn't see any MP2888A controller on that card, so I don't see why you would expect to find one. There seems to be 3x uP9512 so I'm not sure why you're only finding 2x and not 3x of them. One should be for GPU voltage, another for MSVDD and the third one for memory voltage. What is the voltage reading from the uP9512 at address 26 and address 27?

I thought uP9512 was for memory voltage control only.

0.75V at 26 and 1.37V at 27. The third one is on the other side of the PCB.  Is there any other i2c bus? Shall I solder to it? 

The voltage offset of uP9512 is limited to 0 ~ 150mV. Can I reduce the GPU voltage in this way? 

Uploaded files:
  • 26.PNG
  • 27.PNG
Quote from Bruce on 2021-05-03, 10:46
Quote from elmor on 2021-05-03, 09:04

I didn't see any MP2888A controller on that card, so I don't see why you would expect to find one. There seems to be 3x uP9512 so I'm not sure why you're only finding 2x and not 3x of them. One should be for GPU voltage, another for MSVDD and the third one for memory voltage. What is the voltage reading from the uP9512 at address 26 and address 27?

I thought uP9512 was for memory voltage control only.

0.75V at 26 and 1.37V at 27. The third one is on the other side of the PCB.  Is there any other i2c bus? Shall I solder to it? 

The voltage offset of uP9512 is limited to 0 ~ 150mV. Can I reduce the GPU voltage in this way? 

On that card it seems separate uP9512 is used for all rails. It could be that the other uP9512 is on another I2C bus, but I haven't seen any case like that so far. The SDA trace is also tricky on the other side because it goes straight into a via. You could check with a multimeter if the SDA/SCL pins are connected to the other side.

Sorry the uP9512 only offers limited voltage adjustment between 0 to +150mV.

Uploaded files:
  • i2c_front.png
Quote from elmor on 2021-05-04, 09:17
Quote from Bruce on 2021-05-03, 10:46
Quote from elmor on 2021-05-03, 09:04

I didn't see any MP2888A controller on that card, so I don't see why you would expect to find one. There seems to be 3x uP9512 so I'm not sure why you're only finding 2x and not 3x of them. One should be for GPU voltage, another for MSVDD and the third one for memory voltage. What is the voltage reading from the uP9512 at address 26 and address 27?

I thought uP9512 was for memory voltage control only.

0.75V at 26 and 1.37V at 27. The third one is on the other side of the PCB.  Is there any other i2c bus? Shall I solder to it? 

The voltage offset of uP9512 is limited to 0 ~ 150mV. Can I reduce the GPU voltage in this way? 

On that card it seems separate uP9512 is used for all rails. It could be that the other uP9512 is on another I2C bus, but I haven't seen any case like that so far. The SDA trace is also tricky on the other side because it goes straight into a via. You could check with a multimeter if the SDA/SCL pins are connected to the other side.

Sorry the uP9512 only offers limited voltage adjustment between 0 to +150mV.

OK, a little disappointed with this card. After reading the VMOD-header Tutorial, I am trying to use the VMOD header to reduce the GPU voltage.
But I don't know where is FB and Vout pin or pins on this PCB. Can you help to figure it out, please.

Uploaded files:
  • 1-2.jpg