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The company now expects to report revenue of $8.3bn (£5.4bn) for the quarter ending 2 August, up about 9% from last year's second quarter. Earnings are expected to come in at $0.19 per share, up 19%, excluding a special charge recorded in the same quarter a year ago.
On 16 May Dell said it expected to report revenue for the quarter of $8.2bn (£5.3bn) and earnings of $0.18 per share.
The company believes it is continuing to claw back market share from rivals at a time when overall demand is weak. The company's strong results in the current quarter have been helped by growth in the US education, government and consumer sectors, Dell said.
Dell also said it expects its operating profit as a percentage of revenue to be up sharply from both the fiscal first quarter this year and the second quarter a year ago.
Dell is due to report its results on 15 August, at which time it will also provide an outlook for the third quarter.