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Reports are that the -100 model fan is louder and runs all the time.

I'm not sure if it's been changed by an update, but my -500 fan would come on at about 54C. The -300 modle seems to run much cooler ~ 38 - 48C, in which case the fan wouldn't kick on (If it's also triggered at 54C).
 

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No, I don't know the CFM. I replace the one in my -500 with one with a relatively high CFM (don't recall the actual figure). At that time mine was running in the mid 50's. I was having a lot of problems. The fan had a blue led that was very bright, was fairly loud and only lowered the temp by about 2 - 3C. I put the original back in and wired it to run continuously. Low noise, and droped the temp to the mid 40's C. Very few problems since then.

If you do change the fan, it would be wise to keep an eye on the temp. That's a good point.
 

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Yeah, I've been considering going back to the original config to see if it was coincidence (the problems clearing). But then again, why mess with sucess?
 
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