No that's definitely not advisable. More expensive interfaces with more I/O will require external power and they have DSP chips which let you monitor standalone.
Asus R500A-RS52, Windows 8, 2.6gHz i5 -3230M, 6GB RAM,
Cubase Artist 7.0.6, Wavelab Elements 7, Focusrite Scarlett 8i6, The Grand 3, Melodyne Essential, Superior Drummer, EZDrummer and Pop! EZX, Samson CO1, Yamaha P-35, Mackie MR5mk2 monitors, and more....My tunes on: Soundcloud