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IDF 2012 | Haswell expected to use 20x less power than equivalent Ivy Bridge CPU

Haswell expected to use 20x less power than equivalent Ivy Bridge CPU
Haswell expected to use 20x less power than equivalent Ivy Bridge CPU
Modifications made outside of the Haswell architecture will be playing a larger part in the increased energy efficiency of next-gen Intel notebooks and tablets.

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During the opening keynote demonstration, Intel stressed the orders of magnitude reduction in power from the jump to the new generation Haswell CPUs compared to the current "tick" platform. How have engineers gone about in achieving the feat?

A separate session was dedicated solely to power management strategies on the Haswell architecture. Perhaps unsurprisingly, the optimizations to power requirements weren't only done on the CPU side, but mostly on the entire chipset and motherboard themselves. Intel wanted to see how low of a power state multiple key areas can reduce to without suffering performance or latency issues. As a result, new standards have been set across bus interconnects, SATA, USB 2.0, USB 3.0, WLAN, and even DisplayPort chipsets specifically for running on low-power states. Standyby performance enhancements, increased tolerance to power changes, and Runtime D3 (RD3) round up many of the hardware strategies necessary to reach the claimed 20x reduction in power.

As for the software side, BLA (Battery Life Analyzer) will monitor overheads, HDD spindown towns, memory bandwidth usage and track system utilization to study power consumption on a case-by-case basis.

Together, a typical idling SoC can draw only 90 mW compared to 2 W of current generation platforms. Battery life will increase as expected, but by exactly how long was never mentioned.

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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2012 09 > Haswell expected to use 20x less power than equivalent Ivy Bridge CPU
Allen Ngo, 2012-09-12 (Update: 2012-09-12)
Allen Ngo
Allen Ngo - US Editor in Chief
After graduating with a B.S. in environmental hydrodynamics from the University of California, I studied reactor physics to become licensed by the U.S. NRC to operate nuclear reactors. There's a striking level of appreciation you gain for everyday consumer electronics after working with modern nuclear reactivity systems astonishingly powered by computers from the 80s. When I'm not managing day-to-day activities and US review articles on Notebookcheck, you can catch me following the eSports scene and the latest gaming news.