While writing an answer to this question Should I defrag my SSD before creating a partition for Boot Camp? i wondered if a Boot Camped Windows profits from a Fusion drive like OS X on the same drive in the sense of faster read/write access does.
The condition are clear for a pure SSD as well as for a common spinning HD.
In the first case a Windows installation profits like Mac OS X, in the second case the performance is slightly degraded because the Windows partition is almost always situated at the innermost "slower" parts of the disk.
But what's the case with a Fusion drive?
Best Answer
Fusion Drive is an OS X specific way of caching data.
If you use Bootcamp on a Fusion Drive you will get Windows on the hard drive only. Some information from this Apple note