> Sure, other G4's exist. But the Pegasos-2 G4 only shipped (as far as I know) with
> the 7447 1GHz, which is a rather hot chip.

zhulien explicitly referred to "other system's G4s" in comparison to "the Pegasos 2 G4", so he clearly didn't mean any Pegasos 2 by "other system's". That's why I answered his 2nd question by giving him links to overviews about the G4 line in general.

Apart from that, there were a few Pegasos 2 delivered with not the 1.0 GHz 7447, but with 1.4 GHz 7447A:

http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=28068&forum=33&start=220#478498

...which obviously is connected to:

https://morph.zone/modules/news/article.php?storyid=909
http://web.archive.org/web/20061209104109/http://www.pegasosppc.com/freeworkstation.php
http://web.archive.org/web/20060218203834/http://www.genesippc.com/press.php?date=20050907 (look at the current version for some revisionist fun)
http://www.amiga-news.de/en/news/AN-2005-12-00004-EN.html

> I would definately recommend passive cooling.

Really? ;-)