VRM modify ICC_MAX to run high TDC OEM cpu

[TrevorH]

If you can boot linux on the machine then there is a tool called ipmitool that can be used to set IPMI parameters including its ip address.

 

[LiangJiu2212]

Hello. @RolloZ170 I have been trying to locate the jumper points on the H3C 4700G3 motherboard, but I cannot find them. I do not have a multimeter at the moment, so I am unable to measure the corresponding resistance values. I will purchase one if a multimeter is required for this troubleshooting. I also lack clear criteria to identify jumper point faults, and no relevant characteristic signals can be detected on the motherboard at all. Below is the approximate jumper point range I deduced from discussions between you and others, yet I am unsure whether this judgment is accurate.

 

[RolloZ170]

Hello. @RolloZ170 I have been trying to locate the jumper points on the H3C 4700G3 motherboard, but I cannot find them.

it is still all here. The VRM pin for H3C 4700G3 is J266
1 scl, 2 gnd, 3 sda, 4 nc

 

[LiangJiu2212]

@RolloZ170 Thank you very much! I have now found the location, but I have encountered a new problem. I don't know how to properly connect the wire, and I'm worried that connecting it incorrectly could cause a short circuit and smoke.

 

[RolloZ170]

I have now found the location, but I have encountered a new problem. I don't know how to properly connect the wire, and I'm worried that connecting it incorrectly could cause a short circuit and smoke.

there is only low voltage over pull up resistors. you may ask a friend to do this.
other user made it this way (here on HP at otherlocation but same )

 

[LiangJiu2212]

@RolloZ170
It seems that I have succeeded, but I don't know what to do next.

 

[RolloZ170]

It seems that I have succeeded, but I don't know what to do next.

poulate two CPU and power on. you need to find 2x VRM controller with scan.

 

[LiangJiu2212]

[用户=7479]@RolloZ170[/用户]
Today I tried again. I have installed two processors, but without shorting, or when the machine is powered off, it can normally recognize the drivers and devices. After shorting, it cannot normally recognize the MCP2221a. What is causing this?

 

[RolloZ170]

Today I tried again, dual CPU, no short circuit, or the machine powered off can normally recognize the driver and device. After the short circuit is made, the MCP2221a cannot be normally recognized. What is the reason for this?

attention: the colors of the 3rd picture do not match your cable. e.g. black is SDA and so on.

and you are working with J268 not J266

 

[LiangJiu2212]

Thank you! It can now be recognized normally, and two CPUs have been installed. What should I do now?

The MCP2221a device is connected.

scanning at addr: 10
scanning at addr: 11
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scanning at addr: 1A
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scanning at addr: 2A
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scanning at addr: 2C
scanning at addr: 2D
scanning at addr: 2E
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scanning at addr: 3A
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scanning at addr: 3D
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scanning at addr: 4A
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scanning at addr: 4C
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scanning at addr: 5A
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scanning at addr: 6A
scanning at addr: 6B
scanning at addr: 6C
scanning at addr: 6D
scanning at addr: 6E
scanning at addr: 6F
scanning at addr: 70
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scanning at addr: 7A
scanning at addr: 7B
scanning at addr: 7C
scanning at addr: 7D
scanning at addr: 7E
scanning at addr: 7F
press any key.

 

[RolloZ170]

Thank you! It can now be recognized normally, and two CPUs have been installed. What should I do now?

nothing found. still no connection to VRM controller.
if @Zhengrankela is right new H3C have no connection J266 to VRMs.
you may need to contact these points.

 

[oddssodds]

@RolloZ170 I just want to shout out for making these guides! My mcp2221a just came in and I got the breadboard wires soldered onto the board. My server (Dell R740xd) didn’t have the holes blocked off on P4 header so the breadboard wires worked out perfect. I just held all 3 in the header holes with my finger and already had console up on my laptop and hit enter. Thanks to his amazing guides (and console app!) my server now has 2x platinum 8272cl. The actual programming took all of 3 seconds. Thanks again!

Hey codypendant and @RolloZ170 I picked up a R740xd 3/21 production date bios 2.8.2. Cody did you shoot a picture of the p4 header? I am new to this.... a little board soldering, but want to make sure I don't f this up. Rollo, I would follow which guide? Is there just one that pairs with the mcp2221a? My goal is to use two 8252c processors. I understand that there is a pretty specific programming process.

The e5-2699 18 core oc'd to 3.6 has served me well, but it is 15 years old and this chinese motherboard could go sideways at some point.

thanks

 

[RolloZ170]

Hey codypendant and @RolloZ170 I picked up a R740xd 3/21 production date bios 2.8.2. Cody did you shoot a picture of the p4 header?

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

 

[nyara]

Hi,

i am planning to do this mod to my Dell Precision T7820, by getting two 8259CL , does anyone know how well the heatsinks handle this heat (210W per cpu) with two CPUs?

 

[RolloZ170]

i am planning to do this mod to my Dell Precision T7820, by getting two 8259CL , does anyone know how well the heatsinks handle this heat (210W per cpu) with two CPUs?

does not work well. the stock 2U Heatsink can handle 165W.

 

[oddssodds]

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

Wow, thanks. Codypendant wasn't joking when he said that there were just big copper holes in the board. I love that you can just power up the motherboard, without a CPU and run the code. Great work Rollo.

If I can ask another question about PSUs. I am getting a lot of conflicting opinions on requirements. I will have the dual 8252c at 240w, a 3090ti spikes to 500w I'm told, a couple of Nvmes, water cooler loop. Some are saying dual 2000 watt dell units. Some say a single 1600w, seems more correct.

What do you think?

 

[RolloZ170]

If I can ask another question about PSUs. I am getting a lot of conflicting opinions on requirements. I will have the dual 8252c at 240w, a 3090ti spikes to 500w I'm told, a couple of Nvmes, water cooler loop. Some are saying dual 2000 watt dell units. Some say a single 1600w, seems more correct.

What do you think?

single 1600W is enough, your challenge will be cooling of 2x 8252C if you run them at full load longer time.

 

[oddssodds]

single 1600W is enough, your challenge will be cooling of 2x 8252C if you run them at full load longer time.

Right now the plan is to go with a full size case


A pair of these water blocks

this radiator


That should cover the 600 watts

 

[oddssodds]

so the stuff is starting to roll in and it's getting hard to hide from my wife:

And the heatsyncs.

Apparently the board had ethernet built in and probably a usb header inside somewhere, so I won't need the ethernet daughter card, but given I am using that upright case, I think I will use a cable for the PCIe and connect a riser card to that. Hopefullly line it up with the case ports in the back.
Somewhere in this area, but I am worried a riser card sitting on it's side with be too much for the
motherboard.

regarding the programming Adafruit is out of everything. I can get the following:


Will that board work, @RolloZ170 ?

 

[RolloZ170]

regarding the programming Adafruit is out of everything. I can get the following:

Will that board work

YES if th chip is a "MCP2221a" (preprogrammed microchip)