I need to replace a fan in my HTPC, but I have a couple of questions. first, how is a fluid ball bearing different from a regular ball bearing fan? Secondly, one fan caught my eye: EverCool 80mm x 80mm x 38mm EC8038H12BA 12V 3pin Ball Bearing Fan | eBay I'm not as interested in the high speed of the fan as I am the thickness (38mm). Am I right in thinking that a thicker fan will produce more CFM than a thin fan at the same speed? I intend to use this for the blow hole fan atop the HTPC in my bedroom, and since I keep it running continuously, I definitely do not want a high noise level, and I don't know that high CFM is actually a good thing for a fan of this sort, because at high CFM, it might disturb the air flow pattern adversely. But since this fan cost twice as much as most other fans of it's size, my interest in it is just in having the ability to experiment with different speed settings.