[SOLVED] CPU speeds and wattage

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danipoz

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May 31, 2015
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So basically i have an low power 3rd gen intel cpu, *i5-3470S* which base clock is 2.9(3.2 for the non-s version) and boost clock of 3.2 for all 4 cores. The lower power version of the cpu has a TDP of 65W the standard version is 77W.In bios i have an option to increase the turbo clocks all the way up to 3.6 like the standard version of my cpu also the option to lock the wattage my cpu using which is set to 65W. I changed the turbo boost clocks to 3.6 but left the 65w max power. That means i have the performance of the standard version of the cpu with lower tdp?
 
Solution
jojesa
The 65W TDP rating is for the base clock speed (2.90 GHz) of the CPU. That means that @ 2.90 GHz the CPU will output the equivalent of 65W of heat.
So, a 65W TDP CPU doesn't necessarily mean the processor will draw 65W from the PSU. That rating is use to set a value for minimum cooling required for the CPU.
But from that we could assume that a CPU with lower TDP will draw less power from a PSU.

Your i5-3470S CPU might or might not get to draw 65W from the PSU even when Max turbo frequency of 3.6 GHz is reached.
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jojesa

jojesa

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Dec 6, 2006
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The 65W TDP rating is for the base clock speed (2.90 GHz) of the CPU. That means that @ 2.90 GHz the CPU will output the equivalent of 65W of heat.
So, a 65W TDP CPU doesn't necessarily mean the processor will draw 65W from the PSU. That rating is use to set a value for minimum cooling required for the CPU.
But from that we could assume that a CPU with lower TDP will draw less power from a PSU.

Your i5-3470S CPU might or might not get to draw 65W from the PSU even when Max turbo frequency of 3.6 GHz is reached.
 
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