By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks began to show some signs of life Tuesday, with Apple Inc. and Facebook Inc. among the gainers following new, upbeat views from Wall Street analysts.

Apple (AAPL) rose 1.4% to $538.21 after Andy Hargreaves of Pacific Crest Securities raised his rating on the company to outperform, or the equivalent of buy, from sector perform and set a price target of $635 a share on Apple's stock. In a research note, Hargreaves based much of his upgrade on prospects for iPhone sales and the next model of the iPhone, which is likely to come out later this year.

Hargreaves said a larger-screen version of the so-called iPhone 6 is "likely to drive estimates higher" for Apple, and could add as much as $4 a share to the company's per-share earnings in its 2015 fiscal year "if 35% of iPhone customers choose a larger iPhone when they upgrade and Apple is able to capture 10% of the large-format Android market."

Facebook (FB) edged up by 45 cents a share to $72.50. Analyst Ken Sena of Evercore Partners, raised his price target on Facebook's stock to $64 a share from $60, mostly due to the enterprise value opportunities from its acquisition of WhatsApp.

Fusion-io Inc. (FIO) rose more than 5% to $12.29 a share. Pacific Crest analyst Brent Bracelin said the flash-memory storage technology company is seeing more interest in its products from tech resellers and partners.

Gains also came from online retailer Zulily Inc. (ZU), IBM Corp. (IBM), Netflix Inc. (NFLX), Microsoft Corp. (MSFT) and Amazon.com Inc.

The Nasdaq Composite Index (RIXF) rose almost 19 points to 4,353 and the Philadelphia Semiconductor Index (SOX) also edged into positive territory.

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