Mine is the ultrabook, the XPS 13z 2n1. It throttles nonstop, I've even gone so far to rip it open and attempted to re-paste everything inside of it. Unfortunately the ultrabook CPU can't be de-lidded and pasted without breaking things, I was actually the first person on /r/dell to rip this laptop open..

The XPS 13 is a much larger device (better cooling). The 13z ruined me ever buying another Dell. I really wanted to love that laptop and NOT buy a $3k macbook. I really want the 2n1 feature.