That will work very nicely on your XP-90, and if it's too noisy, you can put a
fan controller on it. Yes an Antec 3 speed fan will work also, i would just try
and get 40 or more CFM ...but it really depends on what CPU you're trying
to cool. GL
Is it normal when I run a program like SpeedFan or Everest or MSI Core Center the CPU fan RPM indicator usually goes like this :
Fan speeds normally vary ie: 2654.. 2598..2654...2598..etc. But dropping to zero isn't right. Maybe the tach wire from the fan is loose, or is making a bad connection at the fan itself. I would try another fan, just to check, and if it drops also, then maybe a bad sensor on the mobo.