So, I've seen many a noobies lose their zpools over this topic, so I'm going to go into detail. If you aren't detail oriented and don't want to understand what is going on deep level in ZFS, then just go with ECC RAM. For those of you that want to understand just how destructive non-ECC RAM can be, keep reading. Remember, ZFS itself functions entirely inside of system RAM. Normally your hardware RAID controller would do the same function as the ZFS code. And every hardware RAID controller...
ECC vs non-ECC RAM and ZFS
ECC vs non-ECC RAM and ZFS