Cybervision is impressive a bit OTT but then again the more cooling the better.
can't translate this. a bit what?
WARNING! Recommended PPC chip should always have a fan ontop of the heatsink.
No, it should not.
Note - I have installed a big and _tall_ heatsink on the chip PowerPC. 60mm fan takes a big flow of air and blows it clearly through the radiators of both processors. At full load over the long term PowerPC temperature did not rise above 48 degrees.
This is a good choice of cooling when the cooling is qualitatively the whole board, simm memory, chips between simm, both the processors, and voltage regulator after the processor. You do not get the same using only cooling fan over PowerPC.
In addition, due to great heights radiator now you can't install fan on it.