socket 775 passive coolers

For a passive CPU cooler to work properly it's going to need decent airflow from the case, which I'm not sure you're going to get from just the PSU fan. I would suggest a quieter fan for the CPU cooler instead, seeing as you will always have the PSU fan noise running, as long as the CPU fan makes less noise than the PSU you should not notice it.
 
Also worth noting (thought it's counter-intuitive for some people) - larger fans of the same quality run quieter and cooler than their smaller counterparts (i.e. big fans have to spin less fast to shift the same air as a small fan going a billion RPM).

Might be worth checking the options for realtively cheap and silent fans to replace case + CPU fans to reduce noise.
 
How big is your HTPC? Passive coolers tend to be larger, much larger than actively cooled heatsinks.

Thermalright HR-02 is the obvious choice if it'll fit.

A standard tower though could be set up so the fan spins at <500rpm and that would be reasonably quiet, especially given you have an actively cooled PSU.

As for the mobo fan you could replace that active system with a large passive chipset cooler.
 
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I have replaced chipset coolers with old socket A type heatsinks glued in place with a thermal epoxy mixture.
 
I have a HTPC in a Lian Li V351B - I ran it passively on a Thermalright SI-128 for several months and it never went above 50c, which is obviously still too high for a HTPC but low enough to be safe. I ended up sticking a Apfelfohn fan on it when summer hit and now it doesnt go above 37c lol - and is still very quiet and I cant hear it when in use from the 2m I am away from it.
 
My HTPC has a Q6600 passively cooled by an TRUE @ 2.4Ghz 1.05v, airflow is reasonable but you won't even know the pc is on until the hdd light flashes.
 
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