Processors
Processors (Intel® Core™, Intel® Xeon®, etc); processor utilities and programs (Intel® Processor Identification Utility, Intel® Extreme Tuning Utility, Intel® Easy Streaming Wizard, etc.)
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Tweak a i9-11900K so it has same power usage / TDP as i9-11900T?

Normand_Sammy
Novice
445 Views

I already have a i9-11900K on hand.
I'd like to have i9-11900T power usage...
Is there a way to tweak / Underclock / Downclock the CPU so the i9-11900K behaves like a i9-11900T in terms of energy consumption ?

I want to build a home server. It'll run 24/7. So I'd like the electricity bill to be minimal as possible. I also want to have plenty of power to spare, hence the i9.

The i9-11900T has a base clockspeed of 1.5Ghz and a TDP of 35W. It as a Passmark of 21691.
The i9-11900K has a base clockspeed of 3.5Ghz and a TDP of 125W. It as a Passmark of 25688.
Comparison: https://www.cpubenchmark.net/compare/Intel-i9-11900K-vs-Intel-i9-11900T/3904vs4360

1 Solution
Normand_Sammy
Novice
344 Views
4 Replies
n_scott_pearson
Super User Retired Employee
420 Views

It really depends on the board you are installing it into and the capabilities offered by its BIOS for configuring the processor. It's probably better to purchase a board and processor specifically for this (home server) purpose that it is to waste a higher-end Desktop processor on this.

...S

Normand_Sammy
Novice
399 Views

Hi ...S,

I totally understand your point about right-sizing the processor and motherboard. I plan to run multiple VMs on that server. I was looking for a processor with as many cores as possible.  And I already have the i9 on hand. So that's why I'm exploring my options with this one. If I can lower it's power usage it'll be a bonus. 

 

So for example, if I buy a z590 board from Asus, I'll be able to tweak the CPU. 

Is only changing PL1 and PL2 enough to make the i9-11900K behave like a i9-11900T? Or is there other settings that could be fiddled with? 

When idling, how low can the i9-11900K clockspeed go?  As low as the 1.5Ghz base clockspeed of the i9-11900T? Lower?

n_scott_pearson
Super User Retired Employee
382 Views

No, being able to change PL1 and PL2 should be sufficient for this. You can use it to lower the clock multiplier used at different times.

...S

Normand_Sammy
Novice
345 Views
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