Apple is rumoured to be planinng to introduce revised notebooks as soon as September, a report claims.

According to DigiTimes, "sources" at notebook and component manufacturers claim Apple will launch notebooks that use Intel's new 64-bit "Merom" chip (a Core 2 Duo T7600 processor) in September.

At present, MacBooks and MacBook Pros use the Core Duo T2600 chip (called 'Yonah'). The Merom chip features double the on-chip cache (4MB, not 2MB) of Yonah and runs at lower operating temperatures. They also last slightly longer on a single battery charge.

The original report comes from the Chinese-language Commercial Times.

The report also explains that both Apple's key notebook makers, Asustek and Quanta, ship 200,000-300,000 units per month, and that shipments remain solid "despite the sesonal downturn".