By Benjamin Pimentel and Dan Gallagher, MarketWatch

SAN FRANCISCO (MarketWatch) -- Shares of Yahoo Inc. jumped Wednesday to a multiyear high, leading gains for the tech sector that were offset by a notable drop at Dell Inc. one day ahead of the PC maker's shareholder vote on a privatization deal.

The Nasdaq Composite Index (RIXF) gained 0.3% to close at 3,610. The Philadelphia Semiconductor Index (SOX) and the Morgan Stanley High-Tech Index (MSH) each picked up a fraction.

Yahoo (YHOO) was the biggest upside driver for the sector, with its shares jumping 10.3% to close at $29.66. It was the highest level for the stock since February of 2008, when the company was in buyout discussions with Microsoft (MSFT) that eventually fizzled and sent the stock crashing down below the $20 mark, where it remained until earlier this year.

Wednesday's gains came despite a second-quarter earnings report that showed continued weakness in Yahoo's core display advertising business. Yahoo lowered its forecast for the full year, and CEO Marissa Mayer outlined her plans to invest more in technology and video services as part of an effort to reverse the slowdown in display ads.

Analysts were largely tepid on the core business results, but stayed mostly positive on the stock due to Yahoo's investment in the Chinese e-commerce giant Alibaba, which is expected to go public later this year and provide Yahoo with a sizable gain from its investment.

"In summary, the upside from Alibaba's margins added $3 per share to our sum-of-parts valuation, more than offsetting the $1 per share lost at the core," wrote Jordan Rohan of Stifel Nicolaus in a note, in which he raised his price target on the stock to $33 from $31.

Losing ground on Wednesday was Dell (DELL), which was down 1.1% to close at $12.88. The company is hosting a shareholder meeting on Thursday morning to vote on a privatization bid from founder and CEO Michael Dell worth $13.65 per share.

The deal is opposed by billionaire activist Carl Icahn and several other large shareholders. Icahn has proposed alternative deals that include public warrants, which Dell's board has opposed.

Also, Bloomberg report on Wednesday morning cited an unnamed source as saying Michael Dell and private-equity partner Silver Lake will not be raising their $13.65-per-share offer.

Intel (INTC) shares were down 0.4% to close at $24.15 ahead of the chip giant's second quarter results, due after the closing bell. Shares of eBay (EBAY) rose 1% to close at $57.38 ahead of its own report for the quarter.

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