VRM modify ICC_MAX to run high TDC/TDP OEM processors

[codypendant]

Wasn't able to test yesterday until now.
Turning system on, it halts after 20 seconds or so with a "unrecognized post code" error and turns off.

 

[RolloZ170]

Wasn't able to test yesterday until now.
Turning system on, it halts after 20 seconds or so with a "unrecognized post code" error and turns off.

8272CL can also issue some BIOS trouble like 8273CL/6268CL
but we have already one R740xd working

https://forums.servethehome.com/index.php?threads/vrm-modify-icc_max-to-run-high-current-tdp-oem-processors.38686/post-387028

 

[codypendant]

8272CL can also issue some BIOS trouble like 8273CL/6268CL

Will I need to modify the BIOS?

 

[RolloZ170]

Will I need to modify the BIOS?

don't know. maybe early BIOS with 2nd gen support can help.

 

[codypendant]

don't know. maybe early BIOS with 2nd gen support can help.

Tried downgrading to several different bioses with no luck. Anyone else have experience with R740 and 8272CL?

 

[RolloZ170]

Tried downgrading to several different bioses with no luck. Anyone else have experience with R740 and 8272CL?

better error description ? only one CPU ?

 

[codypendant]

better error description ? only one CPU ?

2 cpus
Only thing I got is “unrecognized post code”. Tried to upload a screenshot but it’s too big.

 

[RolloZ170]

2 cpus
Only thing I got is “unrecognized post code”. Tried to upload a screenshot but it’s too big.

i meant have you tried only one cpu ?
and check if all your VRM power stages(chokes and DrMOS) are populated, dell likes to remove some for better efficiency on lower currents.

 

[codypendant]

i meant have you tried only one cpu ?
and check if all your VRM power stages(chokes and DrMOS) are populated, dell likes to remove some for better efficiency on lower currents.

There is 6 spots but only 5 are populated. I will try with only 1 cpu. I have a picture but can’t upload it.

 

[RolloZ170]

There is 6 spots but only 5 are populated. I will try with only 1 cpu. I have a picture but can’t upload it.

thats bad. only 5+1 ( 6+1 full populated )
picture max 1MB. make picture smaller (irfanview) or upload somewhere and post link.

 

[codypendant]

thats bad. only 5+1 ( 6+1 full populated )
picture max 1MB. make picture smaller (irfanview) or upload somewhere and post link.

 

[RolloZ170]

There is 6 spots but only 5 are populated.

thanks for the picture. imho should not be the problem. 8272CL is only 195W TDP.

 

[codypendant]

thanks for the picture. imho should not be the problem. 8272CL is only 195W TDP.

So I took cpu2 out and I’m booting with only cpu1 and it is booting up now. Showing 8272cl in bios now.

 

[RolloZ170]

So I took cpu2 out and I’m booting with only cpu1 and it is booting up now. Showing 8272cl in bios now.

swap CPU1 with the other.
if work, something with UPI requirements ?
power budget ? PSU upgrade required ? not unusual on OEM servers.

 

[codypendant]

swap CPU1 with the other.
if work, something with UPI requirements ?
power budget ? PSU upgrade required ? not unusual on OEM servers.

It is working, although the fans are at 100% the whole time lol.

 

[codypendant]

power budget ? PSU upgrade required ? not unusual on OEM servers.

I have 750w power supplies. Should I upgrade to 1100s?

 

[RolloZ170]

I have 750w power supplies. Should I upgrade to 1100s?

sorry i realy don't know much about OEMs dell or hp...
just check whats required if you install 2x 205W CPUs....

 

[codypendant]

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?

 

[RolloZ170]

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?

no. you have updated two VRM controllers. they are both accessible with P4.

 

[codypendant]

no. you have updated two VRM controllers. they are both accessible with P4.

Ok.
So I guess I will wait until the power supplies get here and test again. Thanks for your time and knowledge. I will report back in a few days when I receive the power supplies.