The Core i7 launch comes as overall PC demand is weakening in markets around the world. To what extent the new chips will convince buyers to upgrade their systems remains to be seen, and industry observers will be watching closely.

On Wednesday, Intel sent stock markets diving with a warning that it's fourth-quarter revenue will be sharply lower than the company's earlier estimates, signaling that demand for PCs was falling short of expectations. The chip maker also warned that gross margins, a broad measure of the company's profitability, will be lower than expected at 55 percent instead of the previous estimate of 59 percent.

"Revenue is being affected by significantly weaker than expected demand in all geographies and market segments," Intel said in a .

Intel said the revised gross margin estimate was primarily caused by lower revenue projections, but also blamed "other charges associated with the weaker-than-expected demand environment."

Those other charges include the cost of excess capacity and inventory write-offs, according to a research note put out by Credit Suisse analyst John Pitzer, who said the slowdown in PC demand will persist beyond December.