Actually MacOS was converted to x86 Wintel platform twice. Once (at least) internally to Apple but never released beyond the porting group, and once by a 3rd party - around the time of the let's-have-Mac-clones, uh-oh, let's-not-says-Jobs debacle. Said 3rd party effort was purchased by Apple PDQ, and the software banished to the Cupertino vaults. These were both true ports, not VM on add-in board solutions. Reportedly both ran very well.

But where does it say that OSX will run on an x86 "Wintel" platform? I couldn't find it. Merely substituting an Intel chip for a PowerPC chip in a Mac hardware platform does nothing for nobody, except presumably Apple's bottom-line. No way is the Intel a better microprocessor design than the PowerPC (or even the AMD 64-bit chip), it's not even close. It's an old and out-dated base design, and has been for years. Not decrying Intel's ability to crank speed out of that design, but its continued existency has much more to do with Micro$oft, near-monopolies and market inertia, than intrinsic merit.