My laptop is Toshiba Satellite C640 (PSC2UG-00P001). Please visit the following link to see the full configuration. https://www.91mobiles.com/toshiba-c640-x4012-core-i5-2nd-gen-4-gb-500-gb-dos-laptop-price-in-india-59342
The current RAM total capacity is 4GB. 2GB in each slot. its specification...