"why is it the Pegasos 2 G4 can't be passively cooled where some other system's G4s can"
it can be done. my pegasos' got passive cooling on the G4. a giant bastard but silent:) dunno its type at the moment but will post some pictures later if intrested.
DEAD pegII/G4@1000.1gb ram.radeon 9200pro
240 gigz hd.nec dvdrw.MorphOS 2.4 DEAD
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amiga1200T.blizzardppc@180/040@25.96megz ram
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zx.spectrum@3.5