I thought I would make this Thread for informational purposes. When I powered on my MDD tonight, I realized that Tempature Monitor said my CPUs were running at 134F I thought this was odd so I took a look, When I last worked on it I forgot to hook up the wires for the ODD and Main system fans. The system was being cooled solely by the fans I added behind the CPU heatsink and the PSU fans. It ran virtually fanless for over and hour. To sum it up, MDDs will run via Passive Cooling. This was just basic Web Browsing, not sure how well it could handle CPU-Taxing tasks.