looking through the first link, I noticed that for 80mmX80mmX25mm fans, the YSTech ones seem to have the leg up when it comes to CFM/dBa.. do a sort by noise, and notice that as you go up in noise, the YSTech fans seem to jump ahead a bit..
heh, I also notice my 60x60 fan isn't on there.. maybe it's not 25mm tall? hmm... it says on it 2.8 watts.. most of the ones listed in the first link are lower than that (so this one I assume would be closer to the top than the bottom)..
I wonder where exactly these two places get their numbers..