Using the Asus Rampage V Extreme and enabling "Decode Above 4G" In the BIOS from the BOOT menu has resolved this issue. The board is nearly twice the price of the original and still uses the same X99 chipset yet it does the job.
System now completes POST and boots into windows. The Xeon Phi 3120 is detected and been successfully installed.
Still using the:
Intel Core i7 5820K
Intel Xeon Phi SC3120A
Asus ROG Rampage V Extreme (X99/2011-3)
256GB Samsung 850 PRO
HDD Storage Array
Fractal Define R5 Case
Corsair H80i Water Cooling Unit
Windows 7 Pro 64Bit
I hope this message helps others out there looking to build a Xeon Phi into something other than a Brand name Workstation or Server
Hi Glen, thanks for sharing your setup. Very helpful.
Have you tested this setup (e.g. run any applications on the Phi) as yet? I'm looking at building a similar workstation with a Phi 5110P, and it would be great to get some confirmation that there are no problems with an i7 instead of a Xeon CPU, for example.