There are downsides to implementing some of the nifty desktop speed tricks into laptops.
I suggest you benchmark the laptop you think you want to see if it meets your needs.
BEWARE laptops with desktop CPUs since they usually fail in year 2 and suffer odd heat issues plus battery times fall to mere minutes.
Can dual-channel memory be enabled in any laptop computer? If so, how identical do the RAM sticks have to be? Do they have to be from the same company, speed, chip configuration, CAS latency, etc.?