265€ is not much for a PSU of that caliber, and watercooled...
As for your airflow problem, that's your choice. As i stated, i got zero airflow and everything runs fine, and between 36°C and 45°C (approx.). BB2K: heat kills electronics when they run above spec. Most classic electronics components can run to 120°C, CPUs to about 90°C and power components (MOSFETs etc.) to 70°C generally. I've seen mosfets running at around 80°C for years without any problem, in an industrial application...
So below 50°C we've got a pretty comfortable security margin.
Gerwin: forget those fans. Try a chimney. Seriously. It has been done (even on early macs) and reported to work wonderfully. Currently many G4 owners think that way as well. Try a search on their respective forums...
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