It's the RC512 and the zero power sleep to on is under 5 seconds. The model you noted might be 3 seconds.

Samsung also addressed battery LIFE (not to be confused with running time) by allowing a setting to hold the charge at 80% (or close to that) so that the battery will last far past the usual 2 years. Nice thinking.

The aluminum case helps with heat management and under normal use (not gaming) the laptop even with a core i7 is cool to the touch.
Bob