By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks fell mostly to the red on Tuesday morning, with Apple Inc. and Research In Motion Ltd. leading the decliners despite a continued uptick from Dell Inc., as investors speculation about the PC maker going private.

The Nasdaq Composite Index (RIXF) gave up 0.6% to slip to 3,099, while the Philadelphia Semiconductor Index (SOX) and the Morgan Stanley High Tech 35 Index (MSH) were down about 0.7% at last check.

Dell (DELL) shares rose 1.7% to $12.50, adding to Monday's gains that came about after reports said the PC giant is in talks with two private-equity firms about going private. The Wall Street Journal reported that the companies in the discussions were TPG and Silverlake Partners.

Analysts that follow Dell said a buyout of the company is possible, but there are many hurdles to overcome if the world's third largest PC company goes private.

"The likelihood is low, as it would take sizable financing for a company of Dell's size, with its $21 billion market cap," said Shaw Wu of Sterne Agee. "A deal of this size would likely involve multiple private-equity firms and we estimate that the majority of [Dell's] businesses remain under structural and secular pressure."

Apple (AAPL)shares fell 2.5%, to $489.55. On Monday, Apple's stock took a hit on reports that the company has put off orders for some parts for the iPhone 5 due to weaker-than-expected demand for the smartphone.

Nomura Equity Research analyst Stuart Jeffrey cut his December quarter iPhone sales estimates to 48 million from 50 million, and lowered his revenue forecast for Apple to $53 million from $54.2 million, saying that he still believes margins on the iPhone "are unsustainably high and will fall."

Research In Motion Ltd. (RIMM) was upgraded to a buy rating from underperform by Charter Equity on Tuesday morning. But shares of the BlackBerry maker were down more than 4% after jumping more than 10% in the previous session.

In a note to clients, analyst Ed Snyder said the "curb appeal" of the new BlackBerry 10 operating system expected to launch in the coming weeks "could help investors look past Network pricing issues." He cited his "preliminary review" of the new operating system, adding that with "a compelling user interface, 70K applications and RIM's hallmark QWERTY keyboard included in the SKU line-up, we believe the BB10 platform will appeal to a healthy percentage of the company's 80K subscribers, driving an upgrade cycle."

Facebook Inc. (FB) was up a fraction as the social-networking company invited members of the media to an event at its corporate headquarters in Palo Alto, Calif. Some analysts expected Facebook to say more about its mobile efforts at the event.

Declines also came from Hewlett-Packard Co. (HPQ), Oracle Corp. (ORCL), and Nvidia Corp. (NVDA)

(NVDA)

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