SSDs shouldn't make a sound unless there is a fan or something but there are mo moving parts. Hate to say it but i would think about swapping it out. Too much money for something that's not perfect. Plus it could lead to issues down the line.
It appears that this might be normal for the retina macbook pros?
http://www.mackungfu.org/apple-s-non-silent-solid-state-disks-ssds
Could someone else who has received theirs (15" in particular, 1TB SSD preferred) confirm if they can hear electrical noise when running the Blackmagic Disk speed test? Would really put my mind at ease if this is indeed normal.