i have 1 last question, does my case have good ventalation?
Not really, you should invest in a cheap mid tower like an Antec/Coolermaster/Rosewill. You will have much more space, easier cable management and better overall airflow. Here is an example :
There are a few good cases that start at around 35.00/45.00$http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007583%204802&IsNodeId=1&name=Top%20Sellers
If a new case is out of the question I would make sure that the front intake on your current case has sufficient airflow to at least reach the GPU.