Quote:
Originally Posted by Razor6
I use a Danner mag 5. I would have bought the mag 3 but when I saw the price difference was only like $6 for an additional 150gph I said what the hell and got the mag 5.
I would say that for the money they are quite good. The only thing that can be annoying is a slight clattering noise that comes from the magnet riding on the shaft. Danner gave the magnet some free rotation so potential pump jamming material could pass through, which isn't a problem for watercooling applications. I should glue the magnet and shaft together but I'm too lazy. 
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I use a Danner 3. This is my first wc setup so I dont have any experience with other pumps to compare it to. I too thought the little rattling noise was annoying so I used JB weld to connect the magnet and impeller directly. I swear I made every effort to make sure they were perfectly aligned. After that, it would not always start correctly. Most of the time it would just reach a low RPM and make a thrumming noise, every now and then it would start pumping. So I took it apart, scraped off most of the JB weld to free the impeller and fired it up. Now the clattering is gone and it starts every time. Hmm. Dumb luck I guess. Another common complaint is it leaks, but so far mine has not leaked a drop even though I had the front off 3 or 4 times. In my admittedly uninformed opinion it moves a lot of water, maybe more than I need. Its one of the cheaper pumps too. Some have raised concerns about the lack of magnetic shielding. After reading a thread reply from Cathar on the subject I did an experiment where I laid a floppy against the pump casing and start/stop cycled it several times. The floppy lost no files, so Im not worried about any magnetic/emf stuff from it. Too early to comment on reliability, but its been running no problems for a couple weeks now. If you can cure the clattering somehow ( dont ask how i did it, i dont know! ) and nest it in some foam its nearly silent. Mine can just barely be heard a foot or two from the case if you listen closely. Compared to the woosh of the rad fans its inaudible.