Update: Finally got both FCPX and Motion 5 to work after performing Software Update. I think ProRes Kit is the needed things here. Now all runs well :-D
I had posted a thread here on tonymac here in hope that someone will shed a light to me.
This guide by Jeff works as charm. Just follow it if you have similar build as his. The only thing different between my build and his is my graphic card and I'm using TP Link wireless USB dongle. Took me quite a while to find the proper kext for the dongle. Glad that the effort of searching prove to be worthwhile.
It should be 1600 MHz, well I guess losing 80Mhz wouldn't hurt the performance.
Hehe, Mac Pro, or Hack Pro?
Graphic card detected alright. Too bad I still can't output audio via HDMI interface.
Ralink (TP-WN321G) Airport Interface
The following links should guide you on how to install the Ralink kext on your hackintosh.
How to Remove Kext File