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Over the last 6 months, AppleInsider has consistently published reports of an all dual processor lineup planned for the next Power Mac G5 revision. In line with these reports, the service manual shows a large and unified heat sink cover. The current models, which can have one or two processors, have one heat sink per CPU.
Sources also speculate that a revised cooling system could be nestled behind the larger plate cover.
Smaller motherboard
Also apparent from the photos is the existence of a much smaller motherboard in the unreleased Power Mac photos; about one third smaller than the board featured in the current Power Macs. A noticeably longer cable is used to connect the board to ports on the face of the unit.
The larger vacant space in the front of the unit could potentially allow for a terabyte of storage, which was rumored as a possible feature of the new Power Macs, via four 250GB hard drives.
Lack of front inlet fans
Sources also note the apparent disappearance of the front inlet fans cooling the CPUs. While the base of the chassis in the new service manual retains a notch for these fans, the upper ceiling of the area has been replaced with a flush metal plate that no longer supports an upper connection notch.
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