Ultrabooks with Haswell chips could use as little as 100mW while idle
Intel’s upcoming 4th generation Core processors are designed to offer better performance than today’s Ivy Bridge chips, but the new processors, code-named “Haswell,” will also use less power than today’s chips. That means we could see notebooks with tablet-like battery life, and maybe even fanless computers with Haswell chips.
But not only are Haswell chips expected to use less power while active than Ivy Bridge processors, they’ll be able to use far less while idle.
Intel says that devices with Haswell chips will be able to use as little as 100mW while idle. That’s compared with about 3W used by current chips.
In other words, you could start to see ultrabooks that idle like ARM-based tablets, using almost no power at all, while continuing to stay turned on and connected to the internet.
Compare the Haswell 100mW idle consumption with the power consumption of screens. Most 10in type LCD screens consume 2W - 3W.
The 100mW state requires the OS to recognize conditions and put the CPU into the idle state and support the wake up sequence. Intel could get the changes into Win8 drivers and protect the information before introduction where getting these changes into the open source community is like a product introduction.
From the AnandTech Atom vs ARM CPU measured IDLE comparison section.
What's interesting is that there is roughly the same difference between the idle power of the Tegra 3 and Atom z2760 as there is between the Haswell Core architecture and Tegra 3, but the Haswell Core is a huge jump in performance & capability over the Tegra.
It really is hilarious to think back to Warren East's claims about Intel never being able to match ARM's power efficiency.