Yup max is 1400 but I've never gotten near enough to confirm that speed. I'm currently running at 100% (I set speed 100-100% in my BIOS for no variance) and am currently running 1328 rpm.
Random odd noise emanating from the H50 is more likely a bit of trapped air in the flow. I know that people don't subscribe to this idea, but there is a minor amount of air in the system. A full container lacking air does not slosh. This puppy sloshes. At least mine does. It's my assumption that there is air in the system to allow for expansion. I've forgotten what the boiling point of water is but hot water builds up pressure. The system has to be tolerant of possible heat surges or the system could burst.
So try rapping on the tubes with an unsharpened pencil as it's running to see if that clears it up. I myself had that noise for a very short bit and it cleared up soon as I rapped on the outflow tube which is the left one if you're reading the logo right side up.
~CeadderEdited by Ceadderman - 7/16/10 at 8:34pm