I'm not sure exactly how it works, but can you have 2 chokes per phase?
Yes, even more per phase is possible, actually they use 2 inductors per phase in parralel to increase the current capability and reducing the inductor's wire resistance which is a good thing.
But, more "true" phases benefits beats the technque of using more inductors in each phases.
If you have the mobo and understand the topology, just trace the copper traces on those inductors, you will know they're on single phase when both their copper traces are in parralel, or just count for many mosfet "driver chips" (not the mosfet), that will determine how many phases they put into the mobo.
Another approach, each pair of mosfets is always equal to single phase.
Sorry, on the tech speak, can't be more simple than that !
Edit : I did post the chips id on your thread here too.
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