The iMac G5 was updated in March 2005 to the Ambient Light Sensor (ALS) revision. Apple boasted that it was the slimmest desktop computer on the market. The iMac G5 uses an advanced cooling system controlled by the operating system at low CPU loads this rendered the iMac G5 virtually silent. The approximately two inches deep enclosure is suspended above the desk by an aluminum arm that can be replaced by a VESA mounting plate.

The computer used the same 17 and 20-inch widescreen LCDs found in the iMac G4, with the main logic board and optical drive now mounted directly behind the LCD panel this gave the appearance of a thickened desktop LCD monitor. Famously, the Power Mac G5 needed multiple fans in a large casing (or else liquid cooling, an innovative solution Apple adopted for the highest-end Power Mac G5s) because of the high heat output from those CPUs.Īpple's new iMac managed to incorporate the PowerPC 970 into an all-in-one design with a distinctive form factor. By this time, the PowerPC 970 (G5) processor had been released and was being used in the Power Mac G5. In August 2004, the iMac design was overhauled.

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