Advanced Micro Devices Inc.'s second-quarter loss widened sharply and revenue declined 35% from the year earlier as the chip maker continued to struggle with a declining market for personal computers.

For the current quarter, AMD projects revenue to increase between 3% and 9% from the second quarter.

Sunnyvale, Calif.-based AMD is the longtime minority supplier of microprocessors behind Intel Corp. The two companies use the same fundamental design, known as x86, that powers nearly all PCs.

It has been trying to diversify its business, developing chips for gaming systems, for example. But PC chips remain its main business, even as its market share has fallen dramatically. Further, five of its customers collectively accounted for about 61% of its net revenue in 2014, with Hewlett-Packard Co., Microsoft Corp. and Sony Corp. each accounting for more than 13% of consolidated net revenue, according to a regulatory filing.

Shares, which on Thursday set a near 3-year-low trading at $1.87, rose 3.2% to $1.93 in late trading. On July 16, 2014, AMD's shares set a 52-week-high trading at $4.77.

The slowdown of the personal computer market has battered the semiconductor sector. On Wednesday, Intel reported a 3.2% drop in second-quarter profit on revenue that fell 4.6% from the year-ago period.

Chief Executive Lisa Su told Wall Street analysts in May she expected the money-losing semiconductor to return to profitability in the second half of the year. Ms. Su set a long-term annual earnings target for the company of 50 cents a share. In 2014, AMD reported a loss of $403 million, or 53 cents a share, on revenue of $5.5 billion.

Overall, AMD reported a net loss of $181 million, or 23 cents a share, compared with a loss of $36 million, or five cents a share, a year earlier. Excluding a technology transition charge and stock-based compensation, AMD reported a loss of 17 cents, compared with a year-earlier profit of five cents a share.

Revenue fell to $942 million, from $1.44 billion a year earlier.

AMD, which initially projected a 3% decline compared with second-quarter revenue, revised its figures after the quarter ended to the 8% it reported Thursday and said it would log a $33 million charge tied to its manufacturing transition, further squeezing profit margin.

Analysts surveyed by Thomson Reuters had projected a loss of 17 cents a share on $950.5 million in revenue, a 7.7% decline from the previous quarter.

Gross margin narrowed seven percentage points from the second quarter to 25%.

Revenue in its computer and graphics segment fell by 54% from the year-ago period.

Total debt was unchanged at the end of the quarter at $2.27 billion.

Write to Maria Armental at maria.armental@wsj.com and Don Clark at don.clark@wsj.com

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