(Reuters) - Stocks rose on Friday after a strong outlook from chipmaker Nvidia and surprisingly robust consumer confidence offset a slide in bank shares after disclosures of huge trading losses at JPMorgan Chase & Co.

JPMorgan (JPM.N) said it lost at least $2 billion from a failed hedging strategy. The Dow component was down 7.3 percent at $37.77 and weighed on the entire sector.

Nvidia Corp (NVDA.O) rose 8.4 percent to $13.46 after reporting adjusted first-quarter earnings that beat expectations. The stock boosted theNasdaq and was the S&P 500's top percentage gainer.

U.S. consumer sentiment rose to its highest in more than four years in early May as Americans remained upbeat about the job market. The survey was a welcome sign amid worries that the economic recovery may be slowing down.

"It sort of runs against expectations," said Sean Incremona, an economist at 4Cast in New York. "We were looking for a bit of a pullback here but consumers appear to be happy."

Still, the S&P 500 was on track for its second weekly decline, although investors were encouraged after the index has rebounded from 2-month lows hit on Wednesday and looks set to close once again above April lows.

The Dow Jones industrial average .DJI was up 61.57 points, or 0.48 percent, at 12,916.61. The Standard & Poor's 500 Index .SPX was up 7.67 points, or 0.56 percent, at 1,365.66. The Nasdaq Composite Index .IXICwas up 24.74 points, or 0.84 percent, at 2,958.38.

JPMorgan estimates the business unit involved in the trading loss will lose $800 million in the current quarter, excluding private equity results and litigation expenses. The bank had previously expected the unit to earn a profit of about $200 million.

Jamie Dimon, the chief executive of the biggest U.S. bank by assets, cautioned that losses could grow by another $1 billion, another hurdle for a sector already besieged by the sovereign debt crisis in Europe and fears of slowing growth globally.

JP Morgan's news weighed on bank shares as investors feared both a greater risk of more regulation and the potential for more such losses at other banks. However, the stocks were off their lows of the morning.

Citigroup Inc (C.N) lost 2.3 percent to $29.93 and the Financial Select Sector SPDR (XLF.P) was off 0.4 percent to $14.72. The S&P financial sector .GSPF fell 0.5 percent, extending its month-to-date losses to 3.4 percent.

Financial stocks have been among the most volatile in recent months as investors question what the growth outlook for the United States and the debt crisis of Europe will mean for the group's profits. JPMorgan has fallen 11.7 percent this month.

The CBOE VIX Volatility Index .VIX is up 9 percent this month in a sign of growing caution, although it eased somewhat on Friday.

Thomson Reuters/University of Michigan's preliminary consumer confidence index for May improved to 77.8 from 76.4 in April, topping forecasts of 76.2.

Of the 453 companies in the S&P 500 that have reported earnings to date for Q1 2012, 66.2 percent have reported earnings above analyst expectations, according to Thomson Reuters data.

That compares with more than 80 percent at the start of earnings season and is below the average for the past 4 quarters of 68 percent.

(Editing by Dave Zimmerman)

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