i heard that gigabyte sli will create more heat and would be really hot is it true?
True, but nothing to be concerned about with that case. Your case has a couple of 200 mm fans, so that's plenty of airflow. The Gigabyte Windforce cooler will blow the exahusted heat around inside your case, but not to the point of overheating other components. Do some airflow planning and you will have no problems.