In a note to clients — as reported by “AppleInsider” (www.appleinsider.com) — Piper Jaffray analyst Gene Munster says Apple is looking at a record-breaking September fiscal quarter when it comes to Mac sales. He’s predicting sales of 5.1 million Macs during the three-month period.

Munster thinks that Mac sales will be up 5% year-over-year. That compares to an overall computer industry decline of 7% year-over-year for the computer industry, according to new data from the NDP Group (www.ndp.com).

Apple’s previous record for the September quarter came in 2011, when the company reached sales of 4.9 million Macs, notes “AppleInsider.” The Mac’s all-time record came in the holiday quarter of 2011, when Apple sold a total of 5.2 million desktops and notebooks.