Hardware Requirements for Camera and sensor

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Hello, I'm trying to figure out how much computing power do I need for my robot. I plan to put 2 cameras that will use OpenCV for detection of colors, shapes, etc.. and a laser distance sensor (not a lidar sensor, but a simple single-dimension laser sensor).

Some of the sensors and of the cameras will not be fixed, but will be mounted on moving parts, ROS will have to consider their physical location and insert it in a 3D environment with the model of the robot.

I have no idea of the computing power required for these processes, i'm currently thought to this configuration:

AMD A4-3400 dual-core 2.7GHz

2x 2GB RAM (total 4GB)

Is it enough or do I need at least a tri-core processor with 8GB of RAM?

PS: sorry for my bad english, i'm italian.