The new Haswell chips will also deliver much faster graphics and applications performance when they appear in ultrabook designs starting next year, said Dadi Perlmutter, executive vice president and general manager of Intel Architecture Group, during a keynote speech at the Intel Developer Forum in San Francisco.

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Ultrabooks are a new category of thin and light laptops with touch features, but early sales have been disappointing partly due to high prices. There are more than 70 ultrabooks with Intel chips on the market. Some upcoming ultrabooks with Windows 8 will have detachable touchscreens to function as tablets.

The Haswell chips have been designed with ultrabooks in mind, so power usage has been cut to the point that the chip can be used in tablets. Some new Haswell chips will consume under 10 watts of power and deliver performance similar to Ivy Bridge chips drawing 17 watts of power. But Haswell can deliver double the performance compared to Ivy Bridge on the same power consumption, Intel said.

Based on the different power requirements, Intel has also splintered future Haswell chips into two families, which will be available in ultrabooks starting next year. A new family of unnamed Haswell processors will draw under 10 watts of power and will be targeted at convertible ultrabooks. The company is also continuing the venerable Core processors that consume between 15 watts and 17 watts of power. Both the families of processors are based on the Core processor design, but some tweaks helped Intel drop power consumption in the sub-10-watt family.