By Dan Gallagher, MarketWatch

SAN FRANCISCO (MarketWatch) -- Apple Inc. posted solid gains on Wednesday, fueling the Nasdaq and the rest of the tech sector despite notable dips by Google Inc. and Dell Inc.

The Nasdaq Composite (RIXF) rose 7 point, or 0.2%, to close at 3,118, while the Philadelphia Semiconductor Index (SOX) added 1.2%. The Morgan Stanley High-Tech Index was up a fraction.

Apple (AAPL), which has a heavy weighting on the Nasdaq, jumped 4.2% to close at $506.09. The stock has been under heavy selling pressure of late, losing nearly 7% over the last two trading sessions on worries about potentially slowing sales of its iPhone 5.

Several brokers issued positive notes on Apple before the open, pointing to strong results expected for the first fiscal quarter that the company will report next week. Katy Huberty of Morgan Stanley wrote that recent concerns about iPhone sales "are overblown," and she reiterated her overweight rating and $714 price target on the stock.

That helped to offset a downgrade by Pacific Crest -- the second notable downgrade the highly favored stock has seen over the past month.

Analyst Andy Hargreaves lowered his rating on Apple to sector perform, or neutral, citing "evidence of high-end market saturation" as the primary reason for the move. "We believe the high ends of the smartphone and tablet markets are quickly becoming saturated, which is likely to limit Apple's growth by pressuring unit volume and driving a mix shift to lower-margin product."

Google Inc. (GOOG) slipped 1.3% to close at $715.19. Following the introduction of Facebook's "graph search" tool the previous day, some analysts speculated on the potential impact to Google's core Web search business.

"As of now, we do not see Graph Search as a threat to Google Web search," wrote Justin Post of Bank of America/Merrill Lynch in a note to clients, adding that "looking forward, Facebook Graph searches could be competitive with certain categories of Google searches, such as Places and Maps."

He said Facebook remains "a small overhang" on Google's shares. He lifted his price target on Facebook (FB) to $35 from $31. Facebook shares were last trading down a fraction as other analysts issued mixed reactions on the new graph search feature.

Yelp (YELP) shares fell 1.2% to close at $20.36 after Northland Capital downgraded the stock to an underperform rating, saying the new Facebook feature is "highly competitive" to Yelp's core business.

Dell (DELL) shares fell 4.3% to close at $12.61 after gaining more than 20% over the previous two session on rumors that the PC maker may go private.

EBay Inc. (EBAY) was up a fraction closing at $52.90, ahead of its fourth-quarter earnings, scheduled for after the closing bell. Analysts are expecting a 17% gain in revenues for the period.

Yahoo Inc. (YHOO) shares jumped 2.8% to close at $20.07, possibly on speculation about IPO plans by Alibaba, though the Chinese company flatly denied a Bloomberg report that it is making such plans.

Shares of Hewlett-Packard(HPQ) also rose 4.1% to close at $17.21 after The Wall Street Journal reported, citing unnamed sources that potential buyers have expressed interest in acquiring Autonomy Corp. An H-P spokesman said the company doesn't comment on speculation.

Also in the red were shares of Netflix Inc.(NFLX) which shed 4% to close at $97.48.

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