Hernicz

Hi! I've got a Sony VAIO VPCEB2Z1E laptop with Radeon 5650 and Core i5 which has an internal intel graphic core. My question is: Can I swich between these two cards while windows is running, or should I make two boot options, one with Radeon and one with Intel graphics. I want to swith to Intel graphics, beacause it's enough to work or watch videos and doesn't consume as much as Radeon.