I have a laptop with two video cards, but I don't know that much about the laptop's internal structure regarding these cards.
The problem is that laptop monitor is connected to the card of much lower capabilities(64MB dedicated memory) vs the unused one (512MB)
The questions is: can I connect the LAPTOP monitor to the other card?
It may just be a problem of semantics, but a laptop does not have a monitor.
A laptop with a switchable discrete GPU works by having the integrated GPU drive the display output all of the time. When the discrete GPU is active, the integrated GPU simply composits the output to the screen(s), as if the output of the discrete GPU is just one big texture. So, no, to answer your question directly, you can not connect the laptop display to the higher-powered GPU directly.
Most laptops with discrete GPUs allow enabling and disabling the discrete GPU from the BIOS. There is of an appliction that you can run that will activate or deactivate the discrete GPU from withing Windows (and occasionally the propritary driver supports this from other OSes). Disabling the discrete GPU can double the uptime when running on battery, but if the discrete GPU is enabled, it should be used for all rendering regardless, with the integrated GPU operating in essentially passthrough mode.
Edited by Bregma, 05 August 2012 - 01:20 PM.