$200 per computer for the least amount of 'extra quietness,' which includes a Zalman heatsink and some foam
I didn't think it was quite that dear, and I thought ALL the stealth models used a modded or quiet PSU & at least rubber grommets on 'cuda drives... Maybe I haven't paid close enough attention
AFAIK, heat is not an issue in these because each fan is speed controlled & come set at fairly low speed; obviously if things get too hot, you can just turn up the fans a bit.
Speaking of cheap, a little while ago I modded a PC for an accountant's office & built them a new one as well, charging a couple hundred dollars premium for each. Acquaintances. They were absolutely delighted, became champions of SPCR and promised to recommend more PC customers my way... Not that I want such work necessarily.
Even more recently, my got my sis in SF, CA a Stealth ARM PC last week, and she wrote me today
"this computer is downright uncanny, it's so silent! My tech guy who came to load all my software was amazed as well. It's like it's not on."
(mind you she hasn't heard my <16 dB PC
In my experience, people have to actually hear & experience a really quiet computer for themselves before they understand and appreciate all that we silencers are fussing about. But when they do, the penny drops, the light bulb goes on, and they are all smiles and big, round eyes!