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Originally Posted by BillA
spot on
it is the fan plus rad under defined conditions
fan efficiency is twaddle
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I understand this. However, I thought I was only talking about the PA120.x (more specifically the PA120.3 for my purposes) so I thought we might be able to have a discussion specific to that.
@ cathar
I understand this too, and I thought I was bringing that into the equation by saying "I don’t want to get into the situation where I’m adding CFM (and noise) for 10% (or less) gains." I actually meant to say 1% gains which accentuates my point.
I guess I'm saying noise/cooling ratio but I thought this could be discussed without talking about specific fans. IOW, I thought there would be a "in general" sweet spot with the PA line.
Maybe I can put it best by illustration. I thought someone would post something along the lines of:
"Thermochill is right, you aren't going to get increased performance past 100CFM but I've found that you gain (on average) 20-35% from 0CFM up to 60CFM and only an increase of 5% more out of that entire other 40CFM. Therefore, I don't try to push any more than 60CFM through my PA."
I would understand that such a comment would be highly dependant upon the fan in question but it would give me a decent rule of thumb. Am I still chasing my tail here?
EDIT: My basis for even thinking there were some "in general" thoughts on this matter is Thermochill's site itself who obviously have some way of knowing that after 100CFM there is not substantial enough gains to warrant it.