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Let’s talk about the Mac for a change

The fourth in a series of previews of Apple’s results for the third fiscal quarter of 2010



Click to enlarge. Source: Company reports

Between a Steve Jobs keynote in June that ignored it and media feeding frenzy in July that had nothing to do with it, one might almost forget that Apple (AAPL) makes a line of computers called Macintosh.

But it will be hard to ignore the Mac on Tuesday when Apple reports its Q3 earnings. Unless we are badly mistaken, its notebook and desktop computers will have generated between $3.4 and $4.4 billion in sales, representing the company’s second largest source of revenue after the iPhone. (See chart here.)

All the analysts we polled expect Apple’s Mac sales to grow — some more than others. On the high end, Barclays Capital’s Ben Reitzes is looking for Apple to report unit sales of 3.51 million Macs, up 34.8% year over year. On the low end we have William Blair’s Ralph Schackart with an estimate of 2.86 million Macs, up less than 10%. The Street’s consensus — around 3.19 million units — splits the difference.

Below: The Q3 estimates we’ve gathered so far. We’ll add more as they come in.

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[Follow Philip Elmer-DeWitt on Twitter @philiped]