VRM modify ICC_MAX to run high TDC OEM cpu

[Nofiox]

Dell T7820 - T7920

On Dell T7820 i have to power up the system with supported CPU and have at least go to the BIOS.
with the MCP2221a and my CLI app this works fine, VRM addresses are 60 and 62 (if CPU2 Riser present)
here is a great howto

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Dell T7920
VRM addresses are 60 and 62

VRM header location:
View attachment 26612


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and now to something completely different...
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and we have successfully modified a Lenovo P920 motherboard:
controllers are PXE1610C
addresses are 60/62(7bit)
View attachment 39414
I2C header is PJ1100 Pinout:
[1] SCL <-square pad
(2) SDA
(3) Ground (you can use any other GND or LAN plug shield)

get a MCP2221a pcb, microchip
View attachment 26513
i made a c# app for automatic programming(only for MCP2221a). download here

Hello there, hope you're well
I have a P920 with the up to date BIOS. It won't boot with dual 8171M so google research brought me here.
I am wondering, with the MCP2221a and your .EXE is it just a matter of soldering the MCP and connecting the dupont pins to the P920 MB? Or do I also have to solder the motherboard ? And for my understanding, I have to do it twice, once per processor ? Thank you!

 

[RolloZ170]

I am wondering, with the MCP2221a and your .EXE is it just a matter of soldering the MCP and connecting the dupont pins to the P920 MB?

if your P920 does not have a header populated you need to solder
or connect to any GND(e.g. USB/TPM header) and hold the SCL/SDA in contact while programming. but this can brick your board of you disconnect the wrong time.

And for my understanding, I have to do it twice, once per processor ? Thank you!

yes, two VRM controller addresses, but they are both accessible over the same I2C header.

a Lenovo P920 motherboard:
controllers are PXE1610C
addresses are 60/62(7bit)

I2C header is PJ1100 Pinout:
[1] SCL <-square pad
(2) SDA
(3) Ground (you can use any other GND or LAN plug shield)

get a MCP2221a pcb, microchip
View attachment 26513
i made a c# app for automatic programming(only for MCP2221a). download here

 

[Nofiox]

if your P920 does not have a header populated you need to solder
or connect to any GND(e.g. USB/TPM header) and hold the SCL/SDA in contact while programming. but this can brick your board of you disconnect the wrong time.

yes, two VRM controller addresses, but they are both accessible over the same I2C header.

a Lenovo P920 motherboard:
controllers are PXE1610C
addresses are 60/62(7bit)

I2C header is PJ1100 Pinout:
[1] SCL <-square pad
(2) SDA
(3) Ground (you can use any other GND or LAN plug shield)

get a MCP2221a pcb, microchip
View attachment 26513
i made a c# app for automatic programming(only for MCP2221a). download here

Thank you so much! Will check it out and see if I'd dare soldering something to my motherboard..

 

[jbhoodatt]

I'm wondering if the 8174s would be fairly comparable to the 8275cl, they don't have quite the capability on the ram 2666 vs 2933
But the TDP, core count and frequencies seem to be similar, Even a bit higher base clock, I can get a set for half the price...

 

[jbhoodatt]

Thank you so much! Will check it out and see if I'd dare soldering something to my motherboard..

Solder wires to a 3-pin male header and then just press it against your motherboard and hold it, it only takes a second to actually do the reprogramming

 

[RolloZ170]

Solder wires to a 3-pin male header and then just press it against your motherboard and hold it, it only takes a second to actually do the reprogramming

you can reduce this to two(2) wired by connecting to Ground pin of COM port or other header.

 

[jbhoodatt]

you can reduce this to two(2) wired by connecting to Ground pin of COM port or other header.

Correct, hey what do you think of the 8174 vs the 8275cl cpu's

 

[zdudz]

Hello,

I am trying to find on a R7920 the PJP1/PJP2 header to solder my 3 pins. I believe to have a T32V9.I spend a good 30 min to try to find it on the board and looking for R7920 in the thread doesn't bring me anyone which uploaded pictures on where to find this header.

Picture enclosed for reference.

PIC

 

[RolloZ170]

I am trying to find on a R7920 the PJP1/PJP2 header to solder my 3 pins.

they are called different or there are none. i don't have R7920 and i can't help.

 

[celemine1gig]

And another success. Finally got around to modifying my S2600ST, that is now running with 2x 8272CL. Thanks!

However, the short peaks of 500W+ of power draw, in the bootup phase, is kind-of shocking and awesome at the same time.
My previous tries with 8259CL seemed much more reasonable, concerning power-draw. At least on the X11DDW-NT, where they are running.
On paper the difference between the two models does not seem so big.
It might be, though, that the X11DDW is enforcing some power limits, that the S2600ST is not.

 

[zdudz]

they are called different or there are none. i don't have R7920 and i can't help.

Thanks for the fast reply, if there are none, then no solution ? Or can I boot with a supported CPU and changed it from within let's say windows server if installed as bare metal ?
I could see the R7920 in the list of supported motherboards "Dell Precision R7920". if it's another name any idea of to where I could start finding the answers ? Checked on dell data sheet it's not mentioned.

 

[RolloZ170]

Hello,

I am trying to find on a R7920 the PJP1/PJP2 header to solder my 3 pins. I believe to have a T32V9.I spend a good 30 min to try to find it on the board and looking for R7920 in the thread doesn't bring me anyone which uploaded pictures on where to find this header.

Picture enclosed for reference.

PIC

i remember now...
check procedure of R740, the motherboard is the same.

https://forums.servethehome.com/index.php?threads/vrm-modify-icc_max-to-run-high-tdc-oem-cpu.38686/post-365607

 

[RolloZ170]

Please provide a screenshot showing the location of J266, and label SCL, GND, and SDA. Thank you.

https://forums.servethehome.com/index.php?threads/vrm-modify-icc_max-to-run-high-tdc-oem-cpu.38686/post-401923

 

[zeokool]

hello i figured id post in regards to the hp z8 g4 . buddy of mine has two 8259CLs which are 210watt cpus and managed to perform the icc_unlock and they both work great . unfortunately hes going through a lot so i havent had a chance to ask him how he flashed it lol

the vrms . chokes though only 4 phase are pretty beefy

 

[RolloZ170]

Thanks, but I need screenshots of the H3C R4900 G3 J226, not screenshots of the GL380 Gen10.

afaik same motherboard.

 

[zdudz]

i remember now...
check procedure of R740, the motherboard is the same.

https://forums.servethehome.com/index.php?threads/vrm-modify-icc_max-to-run-high-tdc-oem-cpu.38686/post-365607

Thanks a lot and great memories, I'll try it over the next weekend.

 

[Regis3388]

For those who are interested, I want to share my experience with TDC change:
First, I have an older Supermicro X10dri, so previous generation, and so the method described here does not work as is.
I wanted to put in 2 Xeon 2696v4 (150W, TDC 199), while the board is specified up to 145W (TDC 189).

After some researches, I found the VRM are MP2953A (a datasheet for MP2953B is available and I used it).
This gave me the I2C registers and values to change, as described in 1st page of this tread.

Lazy as I am, I wanted to avoid bying an I2C adapter, find appropriate jumpers, and so on, so I thought of the BMC showing VRM temperatures...
Bingo! I found that I could use ipmitool with I2C commands to program the new ICC_MAX.

Example with reading the VendorID and ProductID (VRM are on I2C bus #0 on my board, I2C 8bits addresses 0x42 and 0x4E):

ipmitool -I lan -U <username> -P <password> -H 192.168.0.5 i2c bus=0 0x42 0x2 0xEF
 25 ff
00100101 11111111

After change and save the new ICC_MAX values on both VRM, I stopped the server, changed the CPUs and it worked like a charm !

 

[RolloZ170]

After change and save the new ICC_MAX values on both VRM, I stopped the server, changed the CPUs and it worked like a charm !

well known method. unfortunaly those i2c cmds are blocked by modern BMC firmware because of plundervolt.

 

[RolloZ170]

change ICC_MAX of VRM controller to match thermal design current(TDC) of the processor for LGA4677 platform
Could you write a program for 4677 platform to change TDC when you free?

we never stop learning, update to this:

on LGA4677 platform VR we have Iccmax and Iccmax HC.
used is the sum of the Iccmax plus HC value.
i lowered the Iccmax value only, understandable a 500A CPU not stopped working.
some can try to make a low TDC platform compatible with normal oder high TDC processors.
but you need vendor tool and software, at least for the MPS2973 all is available.
Gigabyte and Supermicro use MP2973 (MPS, preprogrammed 2971)
ASRrock Rack use RAA229126 (renesas)

 

[whitelilis]

no. check what VRM controller is used (near area around the power stages / chokes/coils(grey blocks) )

please provide a picture of VRM section. there are two versions, one with 5+1(ok) and one 4+1 (too weak) power stages.

I have the same mother board.
The follow is the overview. Which place to find the VRM? The board is so big, can you give me some scope ? I will provide more pictures

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