Hi -- I need to replace the case fan on a Micron Millenia XKU 300 tower model. I called Micron and was told that the fan is 92mm variable speed. I am going to order it from http://www.cyberguys.com but out of the three available I don't which is the right one. Here are the options: Case Fan, 92mm Case Fan @ $2.99 Case Fan, 92mm Ball Bearings @ $6.19 Case Fan, 92mm Dual BB W/MB Connector @ $6.99 What's the difference between these three and how do I choose? Thanks, Robin The NOSPIN Group is now offering Free PC Tech support at our newest website: http://freepctech.com