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"The folks at Engadget have posted an exhaustively thorough article on an upgrade they performed on a 400mhz Powermac G4. Specifically, they replaced the stock processor with a PowerLogix PowerForce47 G4/2.0GHz, with 512K 1:1 L2 Cache per processor. In the process, they came up with more comprehensive set of instructions than the rather anemic list that shipped with the PowerLogix processor. After a short trip into the wonderful world of firmware, they've got their Sawtooth purring along happily with its new 2.0GHz heart intact. Check it out.&amp;nbsp;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2005/09/06/engadget-upgrades-a-sawtooth-g4/>