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A bunch of exhaust fans cause negative case pressure and every small opening becomes a debris collector.
Positive case pressure, ideally with filtered intake(s), makes a remarkable difference in keeping your case clean. One or two big 120's running on 7v, pulling through filter media, keep a case quiet and clean.
Internal spot cooling like CPU, GPU, chipset are necessary in either arrangement but the clean case with equal air exchange makes them more effective without maintenance.
For floor-standing systems the difference is like night and day.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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