First QuestionThere is a built in feature to the BIOS where it notifies if a fan spins below a certain RPM. This is a great feature because you'll know when a fan is starting to die or stop spinning all together. If you don't want to turn off this feature (Ignore), you can navigate to the
Monitor tab. Select the
Fan Speed Control option. Go to the option that says
CPU Fan Speed Low Limit. By default, it is at 600RPM. Lower it. Save and exit BIOS.
Second QuestionIf you're using two sticks, you should be using the red slots. Check your CM 212 EVO installation and make sure you didn't overtightened the screws. See if the RAM is seated properly. And in case you suspect the slot to be dirty, blow some compressed air into it.
Third QuestionSend me one of them.
😛 RAID the other two. There is a guide in my signature written by HiViMan that can help you setup your RAID.