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andrewferguson
Paper Tape
Posts: 2
Registered: ‎08-20-2017
Location: GB
Views: 638
Message 1 of 3

Quad Core in T420 - Disable Cores to stay within TDP limits?

For a ThinkPad T420 with a quad-core CPU, where the TDP of the CPU (45W) is greater than the maximum supported TDP of the T420 (35W), would disabling two of the cores of the CPU (through this method) bring the CPU back within the 35W maximum? (A pointless question I know, as if you're disabling half of a quad core, you may as well use an dual core, but I'm curious).

sclexman
Bit Torrent
Posts: 4,580
Registered: ‎11-22-2011
Location: US
Views: 570
Message 2 of 3

Re: Quad Core in T420 - Disable Cores to stay within TDP limits?

Did any T420 ship with a quad core?

All US specs I find show dual core.

https://www.reddit.com/r/thinkpad/comments/252cfg/t420_upgrading_to_a_quad_core_proc_i7_2720qm/

Guru
Posts: 9,598
Registered: ‎12-26-2009
Location: CA
Views: 526
Message 3 of 3

Re: Quad Core in T420 - Disable Cores to stay within TDP limits?

I think he had an after-market quad core installed.

Disabling two cores probably won't explicitly cap TDP to 35W but will certainly reduce maximum TDP. This is of course assuming those cores go to idle when disabled using this method.

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