Grommets installed with drive rails work well for me. You have to put the grommets between the hard drive and rails and make sure they are properly isolating the contact point. It does cut down on ...

and also, how long do the fan screws you use have to be if you've got grommets? the grommets on sale at 2cooltek say they need #6 or #8 machine screws... how long are they? might these screws be long ...