I have got a brand new Dell inspiron 620. But the current PSU is not enough and the system does not have dedicated graphics card. So I am thinking about installing a new PSU by replacing old and also install a new GPU. The PSU will be antec earthwatt 650. Do you think that both of these new components fit into the inspiron 620. The GPU is GTX 560 TI, which is 9 inches. Still I am not sure about this?