By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Gains from Apple Inc., EMC Corp. and Electronic Arts Inc. stood out Wednesday as reaction to those companies' upbeat earnings results helped spur broad gains across the tech sector.

But big losses from Broadcom Corp. and Polycom Inc. also made their presence felt as reaction to the latest round of quarterly reports continued to dominate investors attention.

Apple (AAPL) rose 4%, to $436 a share, after the company reported fiscal third-quarter results late Tuesday that included iPhone sales of 31.2 million units. Those sales topped the range of estimates by Wall Street analysts that follow Apple.

The iPhone sales helped counter a decline in profit, as Apple said its earnings for the quarter ended June 29 fell to $6.9 billion, or $7.47 a share, from $8.8 billion, or $9.32 a share, in the year-ago period.

Dell Inc. (DELL) shares remained near their break-even point of $12.88. Before the market opened, Dell Chief Executive Michael Dell raised his bid to take the computer company private to $13.75 a share from $13.65. Dell is being assisted by private-equity firm Silver Lake, and a shareholder vote on the offer was postponed from Wednesday to Aug. 2.

EMC (EMC) was also having a good day of it, as the data-storage technology company's stock climbed 6.5% to $26.98.

Before the market opened, EMC reported earnings, excluding one-time items, of 42 cents a share, and revenue of $5.61 billion, which met analysts' consensus forecasts. EMC said its results were helped by growth at VMware Inc. (VMW), which is majority owned by EMC.

For its part, VMware shares climbed 15% to $81.80 after the company reported upbeat second-quarter results late Tuesday.

Videogame publisher Electronic Arts Inc. (EA) shares rose more than 8% to $25.86 following its late-Tuesday earnings report. EA said lower expenses and more mobile and digital revenue helped its fiscal first-quarter earnings rise 10% from a year ago.

Facebook Inc. (FB) shares rose 26 cents, to $26.39, ahead of the social-networking company's second-quarter results, due after the close of trading.

With broad gains across the tech sector, the Nasdaq Composite Index (RIXF) rose 13 points to 3,592. However, the Philadelphia Semiconductor Index (SOX) was in the red.

Broadcom Corp. (BRCM) proved to be a big drag on the chip sector, as its shares fell 14% to $27.37. On Tuesday, Broadcom reported a second-quarter loss and said it took a charge of $501 million and wrote down the value of its 2012 purchase of NetLogic Microsystems.

Analysts at B. Riley & Co. and RBC Capital Markets also cut their ratings on Broadcom.

Polycom (PLCM) shares shed more than 10%, to fall to $10, after Chief Executive Andrew Miller resigned from the videoconferencing technology company due to "irregularities" that Polycom's board found in Miller's expense reports. Polycom said late Tuesday that Miller had resigned last Friday. Kevin Parker, Polycom's board chairman, was named interim CEO.

Miller's resignation was announced the same day Polycom reported a decline in its second-quarter earnings and sales.

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