There are passive-fin 1U coolers available, for both P4 & 603s.
About 25-27mm high copper fins, fan-less so cheaper.
For cooling, try to use an 80x15mm Panaflo fan. They are
hard to get, but offer good airflow in a compact package.
Sticking to the 1U theme, it's common to use a 90-degree
PCI adapter in the last motherboard socket on M-ATX boards.
That extends the PCI card horizontally out beyond the board.
Thus potentially allowing a very tall/large heatsink/fan combo,
such as a standard Panaflo 80mm L1A or similar. Even at 25cfm
that is enough to cool 125W at a very near silent 21dB(A).
You would have to verify your case permits such, but it is a
way of "lengthening" the motherboard re cooling/airflow etc.
Most cases will not permit it re "cards running to the floor".
However, if not an ATX board it's possible it may work ok.
Just a thought re changing the physical environment.
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