The sound of fans spooling up are a lot more re-asuring than the smell of ozone
You might want to consider your power supply. I have a funny story regarding power supplies and new video cards posted here somewhere but in a nutshell... The fans in my video card were running quite hard and noisy I figured Id get used to it when "pow" a fuse in the psu blew.
I went out and bought a new, bigger psu now the fans run smoothly spool up and down as they should and are much quieter.