VRM modify ICC_MAX to run high TDC OEM cpu

Notice: Page may contain affiliate links for which we may earn a small commission through services like Amazon Affiliates or Skimlinks.

love1810

New Member
Mar 12, 2025
1
0
1
Has anyone successfully modified it on a Lenovo P720 workstation? I followed the modification method of Lenovo P920. After the modification, the CPU became hot, but the monitor had no output and the keyboard light was not on. Please advise
 

RolloZ170

Well-Known Member
Apr 24, 2016
7,667
2,414
113
Has anyone successfully modified it on a Lenovo P720 workstation? I followed the modification method of Lenovo P920. After the modification, the CPU became hot, but the monitor had no output and the keyboard light was not on. Please advise
CPU ? , BIOS ?
 

Zhengrankela

Member
Oct 12, 2024
42
5
8
Lenovo P720 has BIOS verification. If you modify the BIOS and damage the checksum, it will automatically power down
 

Zhengrankela

Member
Oct 12, 2024
42
5
8
This should be a set of logic used by Lenovo on laptops. Verify Ami BIOS through external BIOS modules. I recommend flashing back the backed up BIOS or trying to find the troubleshooting module of the Lenovo plugin and remove it. The default BIOS supports CPUs with 4, 5, 6, and 7 steps. Do you want to use the P8124 or ES processor?
 

RolloZ170

Well-Known Member
Apr 24, 2016
7,667
2,414
113
in fact it dos not support any step 0 1 2 3 cpu , because the microcode is lack in the bios
to be correct the lack makes it not unsupported ( Xeon E5 hack, remove microcode )
and the existance of the microcode means not 100% supported in any cases,
 

Zhengrankela

Member
Oct 12, 2024
42
5
8
to be correct the lack makes it not unsupported ( Xeon E5 hack, remove microcode )
and the existance of the microcode means not 100% supported in any cases,
Indeed, that's the case. However, Lenovo's AMIBIOS verification protection mechanism has been giving me a headache for a year. Although the P720/920 uses AMIBIOS, Lenovo has developed its own protection mechanism. There is no protection mechanism on the motherboard in the absence of BMC, which detects whether the BIOS has been modified. If there is any modification, the power will be immediately shut down. .. Fortunately, I purchased Lenovo's factory BIOS through Taobao, which is called DebugBIOS by Supermicro. It contains microcode 01234 internally, allowing me to successfully power on the P8124
 

Aaron2099

New Member
Jan 12, 2025
11
0
1
So I have 1100w power supplies coming. They were only $19.
I was noticing something. The header we used from your guide is P4 and it’s close to the VRM section for cpu2. I noticed close to the cpu1 VRM section, there is a P7 header. Could that be something we are interested in?
I removed the CPU and memory of Dell R740, leaving only the motherboard. I plugged in the power supply, but I was unable to update data using the SCL GND SDA connection. I couldn't find the VRM controller. How did you operate it? Thank you
 

Aaron2099

New Member
Jan 12, 2025
11
0
1
Hi...
Dell R740xd mod done , top perfomance now, xeon 8272cl
Thanks RolloZ170
His problom been solved,the result is his MCP2221A device was broken being caused his every move were failed.
My laptop connect his MCP with 000000000 device id.

View attachment 42427
I removed the CPU and memory of Dell R740, leaving only the motherboard. I plugged in the power supply, but I was unable to update data using the SCL GND SDA connection. I couldn't find the VRM controller. MCP2221A USB problem ?