<< Thanks for the information. I can't understand why these things are so popular if they are so bad for cooling. I suppose it's just another way to sell shoddy products for ridiculous prices - $15 for a tiny bit of plastic, lol. Who do they think they're kidding?
I'm using an Alpha 6035. Do you know if that will accept an 80mm fan without an adapter? I've seen a very quiet Papst 80mm fan which looks like it would be perfect for the job. I can't seem to find 60mm Papsts anywhere for some reason. Don't they sell them anymore? >>
Well, for extreme air-cooling, I suppose they could be good. A big fan could out-class a smaller fan while not eating its own backwash and overcoming the center dead spot due to very high static pressure. Imagine some monstrous 200CFM 120mm fan on a 120mm->80mm adapter on an AX-7, PAL8045, etc (yes, 120mm->80mm adapters exist...).
That's just a guess though.
For purposes of sound level efficiency though, I'd have to agree that there doesn't really seem to be too much practicality in an adapter.