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Beginner
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TDP-Up increase after update fix error "Spectre" and "Meltdown"

My Cpu i5-8250U

https://ark.intel.com/products/124967/Intel-Core-i5-8250U-Processor-6M-Cache-up-to-3_40-GHz Intel® Core™ i5-8250U Processor (6M Cache, up to 3.40 GHz) Product Specifications

TDP-Up = 25W

and

TDP-Up increase after update fix error "Spectre" and "Meltdown". TDP-up = 44W

I need an explanation!

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Moderator
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nhuson269 - We can investigate this. Please provide information on your system/motherboard model and what BIOS update you applied for the Spectre/Meltdown fix.

Thanks.

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Beginner
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I use Laptop Hp Probook 450 G5

Bios 01.02.02

https://support.hp.com/us-en/drivers/selfservice/swdetails/hp-probook-450-g5-notebook-pc/17047142/mo... HP Software and Driver Downloads for HP Printers, Laptops, Desktops and More | HP® Customer Support

I use TDP-ups? 44W or 25W !!

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Community Manager
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Hi nhuson269,

 

 

We are still working to get an answer for you. Thank you for your patience.

 

 

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Beginner
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I will wait for the answer, thank you.

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Community Manager
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nhuson269,

 

 

XTU was not designed to be reflective of cTDP-up. The Turbo Boost Short Term Power Max value you have highlighted is a different limit that's commonly used for overclocking. The 2 values (cTDP-up and Turbo Boost Short Term Power Max) do not need to be the same.

 

 

Here's some additional information on how cTDP-up works:

 

Intel Sky lake\Kaby Lake\Coffee Lake BIOS programming recommendation for cTDP_UP is to resolve the PL2 value from CONFIG_TDP_LEVEL2_MSR_0x64A. Expectation is that BIOS will end up programming up to PKG_TDP_LVL2 * 1.25 as the PL2 value.

 

 

In your case the processor has a 25w cTDP PL1 value. BIOS would then program up to a 30w PL2 value if the design of the form factor can allow for it.

 

 

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