i purchased a used pc "not specifically for gaming" it has a core 2 duo 2.8 ghz integrated graphics 8 gb ram and 1 tb harddrive. I am trying to make it into a gaming pc so i wanted to try it out in stock form to see what i should upgrade . HOWEVER i tried to play tf2 but it was so laggy i couldnt play , like if i moved it would take about 15 secs to respond. So what i wanted to know is that is the cpu just not good or are the integrated graphics holding it back. (i ran the game on the lowest settings possible and the computer was restarted so their is no old files taking up space)the cpu is a lga775 socket and i have a 50$ budget to upgrade it