thank you sna for a discrete answer of "can my pc be upgraded or not", but no thanks for the recommendation about power and vga combination because im not thinking of upgrading now, but somewhere in the future. But it is glad too know that it can be upgraded and i didnt chose the wrong path of buying a laptop instead. although im thinking that a hd7750 /gtx 650 will be fine for me as my monitor max res is 1366 x 768
But just for the info , the maximum budget will be based on how good am i this semester
, so actually a Titan is possible if i get the best at class as long as it doesnt blow my electricty bills at first
( im just kidding, i know it wont fit to my case)