Intel may roll out a faster version of its Pentium 4 processor for notebook users today, according to a US source familiar with the company's plans.

On Sunday the chip maker cut prices by as much as 27 percent on some existing mobile processors, apparently in preparation for the launch.

New chips on tap for Tuesday include a Mobile Pentium 4 running at 1.8GHz, the source said.

That is an improvement on the existing speeds in that family of 1.7GHz and 1.6GHz. Intel will also introduce slower versions of the chip to round out the product line, the source said.

It wasn't immediately clear which notebook makers would offer the chips in new systems, but at least a handful of major system makers typically climb on board for an Intel speed upgrade.

The company plans to make sure the new chips are available at US retail outlets, where they were sometimes hard to come by after the first mobile Pentium 4 processors were launched in March, the source said.

An Intel spokeswoman declined to comment on products that have not yet been announced.