Originally Posted by Cyclops
To clarify, it's not a ratio, it's a rating. I simply add delta temperature to noise and then devide it by 10. It's just a way of showing how much a fan can cool relative to how much noise it produces. Obviously the lower the number, the better the fan performs in that criteria.
Thanks for the link, I'll take a look at it.
So wait... (delta T + decibels)/10?
If a fan can cool more... (ie, higher delta T), then its rating goes up.
If a fan is loud... (ie, higher decibels), then its rating goes up.
Is a high rating desirable, or a low rating? A loud, high performance fan has a high rating. A soft, low performance fan has a low rating. A high performance, low noise fan has a moderate rating and a low performance, high noise fan has a moderate rating. I don't get how the current rating is useful for anything given that a high performance, low noise fan (the best kind) is rated the same as a low performance, high noise fan (the worst kind).
A low rating could be achieved by a 500 rpm 120mm fan.
A high rating can be achieved by a 5400 rpm 120mm fan.
Neither of the above are necessarily good fans...