VRM modify ICC_MAX to run high TDC/TDP OEM processors

[oddssodds]

I am going to read more carefully, but this is my situation

I bought a 7820 dual processor dell set up. It has silver 4110 in it.

Knowing nothing, I purchased a pair of 8252c processors. Obviously the machine wouldn't start. I would love to use these 240w processors, but the questions are:

With a 950w power supply, am I hitting the wall?
Does this motherboard require a physical mod?
Am I missing anything?

Thanks everyone

 

[RolloZ170]

I bought a 7820 dual processor dell set up. It has silver 4110 in it.

With a 950w power supply, am I hitting the wall?

should work without a power hungry GPU.

Does this motherboard require a physical mod?

yes, watercooling: the 2U FANs can NEVER EVER cool 240W(288W max.)

 

[chrgrose]

I am going to read more carefully, but this is my situation

I bought a 7820 dual processor dell set up. It has silver 4110 in it.

Knowing nothing, I purchased a pair of 8252c processors. Obviously the machine wouldn't start. I would love to use these 240w processors, but the questions are:

With a 950w power supply, am I hitting the wall?
Does this motherboard require a physical mod?
Am I missing anything?

Thanks everyone

You'll need to use Rollo's mod. But I would be curious about performance of 240W processors in dual configuration on the T7820. Those tiny stock Dell heatsinks are not very effective coolers. I question whether even 205W processors can be effectively cooled by them. Maybe if you used >10 W/m/K paste and set the base CPU fan speed to 100%. But if you perform the mod you could at least do single processor with the larger heat sink.

Anyone know if you could use a 3175X on a T7820 after applying the mod? That could be more worth it.

 

[CyklonDX]

I question whether even 205W processors

dell offers 2 heatsink parts (one low grade only up to 120W or something, and another one for 160W)
The 160W heatsink has more copper and is substantially heavier (its capable of keeping 205W cpu's cool enough - not full 24x7 load, but typical load). The 120W isn't capable, even if you have fans with 7k rpm blowing it.

(there is another aio one, but price wise it makes no sense; and best part no documentation from dell on the part numbers - and they look about the same -- same for poweredge servers hah.)

 

[RolloZ170]

Anyone know if you could use a 3175X on a T7820 after applying the mod? That could be more worth it.

works with modd but the BIOS supports no overclocking and XTU can not access required registers.

 

[RolloZ170]

The 160W heatsink has more copper and is substantially heavier (its capable of keeping 205W cpu's cool enough - not full 24x7 load, but typical load).

some run 2x 8251C on 7920T. no way with stock coolers, they applied custom water.

 

[chrgrose]

works with modd but the BIOS supports no overclocking and XTU can not access required registers.

So it would at least behave consistent with its 'stock' specifications, yes? I was an early adopter of the 3175X on the Dominus, and played with overclocking for a while on a custom loop before just deciding to go stock and was still perfectly happy.

 

[RolloZ170]

So it would at least behave consistent with its 'stock' specifications, yes?

correct.

 

[CyklonDX]

some run 2x 8251C on 7920T. no way with stock coolers, they applied custom water.

I agree, no way stocks can keep 240W cool under load.

This is the top solution from dell for t7920 (aio's) but i doubt they can cool down 250W on full load - more like mixed load.
(but they are so rare, that i even struggle to find any link to them - they might as well not exist - they come with "120"mm rads and fast fan)

 

[oddssodds]

I agree, no way stocks can keep 240W cool under load.

This is the top solution from dell for t7920 (aio's) but i doubt they can cool down 250W on full load - more like mixed load.
(but they are so rare, that i even struggle to find any link to them - they might as well not exist - they come with "120"mm rads and fast fan)

What are the chances that these are BS?

Intel Socket 3647 Series 240W 2U Server CPU Cooler--

Cooltron is leading manufacturer of ball bearing and sleeve of DC/AC axial fans, EC fans, cross flow fans, centrifugal fans and DC/AC blowers. We offer a one-stop cooling solution!

www.cooltron.com

I cant find anyone who has actually tested them

 

[RolloZ170]

What are the chances that these are BS?

Intel Socket 3647 Series 240W 2U Server CPU Cooler--

Cooltron is leading manufacturer of ball bearing and sleeve of DC/AC axial fans, EC fans, cross flow fans, centrifugal fans and DC/AC blowers. We offer a one-stop cooling solution!

www.cooltron.com

I cant find anyone who has actually tested them

240W(@25C) ? doubt that realy.
specialy the second cooler can never get 25C degree air temp input, he gets hot air from first socket.

 

[oddssodds]

240W(@25C) ? doubt that realy.
specialy the second cooler can never get 25C degree air temp input, he gets hot air from first socket.

Yea, I agree. seems like they are rating it on hopes and dreams

Looked into the Dynatron aios, but there just isn't enough room.... its close, but not close enough to roll the dice on fabrication.

Dynatron L8 All-in-one 1U Server Liquid Cooler Intel Socket FCLGA3647

Dynatron L8 All-in-one 1U Server Liquid Cooler Intel Socket FCLGA3647

aerocooler.com

 

[CyklonDX]

If you are in air conditioned environment, and fan goes 9000rpm as said in spec, i could see it.


As i recall this might be what they offered from dell; add high performance fans that go 7-9k rpm you should be able to deal with 250W easily.

Dynatron L13 LGA3647 Narrow ILM AIO Liquid Cooler

Dynatron L13 all-in-one Liquid Cooler for 4U Workstation, recommend for Intel Xeon Platinum / Gold Family Processor, Socket FCLGA3647 with narrow ILM. Stand-alone Water Pump with 12cm PWM fan for CPU Heat Dissipation 205 Watts and up.

mitxpc.com

2U AIO liquid cooler-3647-Icicleflow technologies_Pump,Liquid quick connector,Liquid cooling system

Icicleflow technologies works to provide the best liquid cooling solution, quality service, In order to achieve that, we determine to the following actions.there are three directions for our development:Pump,Liquid quick connector,Liquid cooling system

www.icicleflow.com

 

[oddssodds]

If you are in air conditioned environment, and fan goes 9000rpm as said in spec, i could see it.


As i recall this might be what they offered from dell; add high performance fans that go 7-9k rpm you should be able to deal with 250W easily.

Dynatron L13 LGA3647 Narrow ILM AIO Liquid Cooler

Dynatron L13 all-in-one Liquid Cooler for 4U Workstation, recommend for Intel Xeon Platinum / Gold Family Processor, Socket FCLGA3647 with narrow ILM. Stand-alone Water Pump with 12cm PWM fan for CPU Heat Dissipation 205 Watts and up.

mitxpc.com

2U AIO liquid cooler-3647-Icicleflow technologies_Pump,Liquid quick connector,Liquid cooling system

Icicleflow technologies works to provide the best liquid cooling solution, quality service, In order to achieve that, we determine to the following actions.there are three directions for our development:Pump,Liquid quick connector,Liquid cooling system

www.icicleflow.com

the fans on the dynatron spin much higher than that, but the radiator won't fit

 

[dstl1128]

Thanks @RolloZ170 and @PandaChan for Dell T7920 mod guide and pictures.

Using 1P 8259CL now with good temp (full load 68C-75C with room ambient temp ~33C, 20% CPU fan BIOS setting).
Will add another one later on and see how the temps go.


p/s: Not mention in the guide - is the step to disable the case-intrusion sensor on the top right corner of the board with a jumper.

 

[byscott]

@RolloZ170 Now, is there any way to modify icc_max for WS C621E Sage while maintaining warranty (without soldering)?

 

[RolloZ170]

@RolloZ170 Is there any way to modify icc_max for WS C621E Sage while maintaining warranty?

sorry i never got one for modifying and some owner couldn't find access to the VRMs Bus.
there are some (unpopulated)headers, soldering is required to that or directly to some SMD resistors at the VRM controller.
but i know none who have done that so far.

 

[byscott]

sorry i never got one for modifying and some owner couldn't find access to the VRMs Bus.
there are some (unpopulated)headers, soldering is required to that or directly to some SMD resistors at the VRM controller.
but i know none who have done that so far.

Thanks for your reply. I saw someone else's modified version on Xianyu, a Chinese second-hand market, but he was unwilling to reveal any information.
闲鱼 - 闲不住？上闲鱼！ (goofish.com)

 

[RolloZ170]

Thanks for your reply. I saw someone else's modified version on Xianyu, a Chinese second-hand market, but he was unwilling to reveal any information.

its not rocket science. find the SMD resistors in line of the I2C bus of the PXE1610C, solder(or use test pins)
the cables to connect the (Adafruit)MCP2221a device.

 

[versatilist]

Thanks @RolloZ170 and @PandaChan for Dell T7920 mod guide and pictures.

Using 1P 8259CL now with good temp (full load 68C-75C with room ambient temp ~33C, 20% CPU fan BIOS setting).
Will add another one later on and see how the temps go.


p/s: Not mention in the guide - is the step to disable the case-intrusion sensor on the top right corner of the board with a jumper.

What bios are you running? Have you experimented with various versions to test performance changes from microcode?