I can confirm that it works. I do not have a 6 core CPU but my W5580 is detected correctly and the ram is running at 1333mhz.
Nice to hear that the RAM update already works. Now it's time for someone to pop in some hex cores.
Found a pretty good deal on a X5680 on ebay. 700 quid a pop. That would be less than 1000 quid for the whole upgrade from 2.26GHz to a 3.33 hex core (which already has more performance and leaves the option to pop in another one of those