Haswell vs. Bay Trail

Aspiring techie

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I've been noticing that some Bay Trail CPUs are used in laptops. These CPUs have have great specs from the outside. Example Pentium N3530 is quad core and has a max clock of 2.56 GHz. However, I've seen some benchmarks that show that Haswell U CPUs (such as the Pentium 3558U only 2 cores and 1.8 GHz) actually beat out the Bay Trail.

I have two questions. My first one is why? Why do benchmarks show that Pentium N class Bay Trail get thrashed by Haswell even though they have seemingly better specs?

My second one is, how can Bay Trail CPUs sustain higher clock rates and sport up to 4 cores, and yet still have a smaller TDP? For example, the Pentium N3530 has a TDP of only 7.5 watts and the Pentium 3558 has a TDP of 15 watts even though it has a much lower clock rate and two fewer cores.
 
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More technical is a bit difficult as I don't drill down into the nuts and bolts of processor design.

There are other features on the Haswell chip that would contribute to a higher power consumption: larger memory controller, more PCIe lanes, the circuitry for RapidStorage and HD audio processing, better built in graphics, etc.

http://ark.intel.com/compare/78945,81074 this puts your two chips side by side, where some of the above becomes apparent.

Saberus

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Here's the best I can explain:

Haswell is performance oriented, and Bay Trail is efficiency oriented.

Haswell is set up to do as many operations per clock cycle as is practical, which both chews up more power and gives it the performance edge over the faster clock of the Bay Trail, which is not as complex to reduce its power consumption.
 

Aspiring techie

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Mar 24, 2015
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If you can make the explanation more in depth and technical, would be appreciated.

Thanks, though for the explanation
 

Saberus

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More technical is a bit difficult as I don't drill down into the nuts and bolts of processor design.

There are other features on the Haswell chip that would contribute to a higher power consumption: larger memory controller, more PCIe lanes, the circuitry for RapidStorage and HD audio processing, better built in graphics, etc.

http://ark.intel.com/compare/78945,81074 this puts your two chips side by side, where some of the above becomes apparent.
 
Solution