Lifer,
I just built that board up with a 860 chip. you will need to pop the heat sync off and dremel it but it works fine.
http://www.tbrstudio.com/images/cpu/chip2.jpg
http://www.tbrstudio.com/images/cpu/chip1.jpg
http://www.tbrstudio.com/images/cpu/hdcards.jpg
http://www.tbrstudio.com/images/cpu/hdrig.jpg
I may pick up a 4th card now that I hear it will work.
So far so good. A few issues, but mostly stable.
Doc