Dell Alienware M17x R3 (Early 2011) - Manual (Page 117)

CHAPTER 7: SPECIFICATIONS
115
AC Adapter
Type
150 W/240 W
Input voltage 100‑240 VAC
Input current (maximum)
150 W 2.50 A
240 W 3.50 A
Input frequency 50‑60 Hz
Output current
150 W 7.70 A (continuous)
240 W 12.30 A (continuous)
Output power
150 W 150 W
240 W 240 W
Rated output voltage 19.50 VDC