Hey there.
Unfortunately I don't see any video posted in the thread.
Anyway, your RAM modules can't emit any noises/sounds. It's most likely a fan or a hard drive. I'd recommend that you backup any important information you might have on your HDDs, just to be on the safe side. After that go ahead and check them out with a drive diagnostic tool (preferably the manufacturers' tools), to see if there's anything alarming. If everything seems fine, perhaps it's one of the fans inside your case, so a cleanup might do the trick.
Hope that helps. Please let me know how it goes.
Boogieman_WD