TY for the replies. I've noticed when I do certain things, like when certain windows are present on the screen, I get an additional whining sound that comes from the tower. I haven't noticed it increase while gaming though.
The overall whining sound has gotten more noticeable than when I first heard it a week or two ago. It's so annoying!
Guess it's time to fill out an RMA...here's to hoping it's still under warranty.