VRM modify ICC_MAX to run high TDC/TDP OEM processors

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juey90

New Member
May 13, 2024
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I am back on this topic after a few days off.
I found the i2c header easily, it's right next to the controller IC.
Hi, could you please provide a picture of the i2c header/pinout ?
Is it this ?
photo_2024-05-13_15-41-55.jpg

And what is the Pinout there ? GND/3V3/SDA/SCL ?
 

RolloZ170

Well-Known Member
Apr 24, 2016
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Hi, could you please provide a picture of the i2c header/pinout ?
Is it this ?
should be the 3pin VR-Debug header in top middle of your picture. find out which is ground and trace other two to the controller chip.
TPS53679 pin24/26
 
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conan2095

Member
Aug 3, 2020
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Alex0220

Active Member
Feb 13, 2021
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I have a few S2600BPB boards(Four node chassis). Can I run 2x 8273CL without the VRM Mod?
 

Alex0220

Active Member
Feb 13, 2021
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8275CL looks interesting too. But I'm not sure if I can cool two 240W CPUs, each node has three or four 20K RPM Fans, so there is a lot of airflow.
 

RolloZ170

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Apr 24, 2016
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I have purchased MCP2221a and ElmorLabs EVC2SE and flashed Supermicro X11DPG-QT with your tutorial, how to flash this TI 1701021 chip
with ElmorLabs create TPS53678_PMBUS.xml, take the xml script for "TPS53679_PMBUS.xml" on page 1 but:
replace this
<Data>7901</Data> <!-- 7901 = tps53679 -->
with
<Data>7801</Data> <!-- 7801 = tps53678 -->

with MCP2221a you can use my c# cli app, supports tps53678 already.
 

conan2095

Member
Aug 3, 2020
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with ElmorLabs create TPS53678_PMBUS.xml, take the xml script for "TPS53679_PMBUS.xml" on page 1 but:
replace this
<Data>7901</Data> <!-- 7901 = tps53679 -->
with
<Data>7801</Data> <!-- 7801 = tps53678 -->

with MCP2221a you can use my c# cli app, supports tps53678 already.
Pls is it to replace this place
无标题.png
 
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codedata

New Member
Mar 20, 2024
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I successfully modded the Lenovo SR650 Server to run two Xeon 8259CL Processors.
Used RolloZ170's software. The scan revealed that I had to modify addr 74 and 76 on the PXE1610C chip.
Header location is under the fan assembly and looks like the other images here (like on Rollos Post from Jan 8, 2023).
You can boot the server into the System Setup (F1 on Boot), remove one of the middle fans out of the assemby and attach your cables on the fly. I used of the LAN shields for Ground, so you only have to manage two cables with your fingers. A bit tricky, but doable.

Great work @RolloZ170 ! Thanks!
 
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