Nobody made even a close estimate, the answer is 13. Tomorrow I'll upload pictures and a list of where each fan is located. I figured if anyone looked at the Ultimate PC thread and then researched some of the links or even just used their noodle they would have come up with at least 12.
In the picture above you can see the two Digital Video Inputs on the double slot EVGA Graphics board. That 2nd slot above the DVI's is for the graphic board's fan!
There are still two more fans.......
BTW The Rocket Upgrade is going badly. Not with the Rocket PC but with the Dell PC I am using now. I had it all set up to "take over" however it crapped out on me on Friday night and I had to do a System Restore. Good old MS says that a System Restore does not delete your data files, NOT TRUE, it wiped out my email accounts and 5 years of emails plus all my custom HTML coding data in my my HTML software as well as custom data in my graphics editing software! Since I know that MS SUCKS and never trust anything they claim I do have a back up copies. Wasted all of Saturday re-setting the Dell to my needs. To bad I can't run Apple's Leopard OS on the Rocket, that would be so sweet.
As an aside last week I loaned my Mac Mini with the Leopard OS to a friend while I fixed her Dell PC. She was flabbergasted that all I had to do was sit it on her desk, plug in the power cord, plus her peripherals and the Mac found and installed all the proper peripheral drivers automatically. When I returned her repaired Dell PC on the weekend her teenage kids didn't want it back, they wanted to keep the Mac Mini.