are these parts compatible with a dell inspiron 620. cpu=http://pcpartpicker.com/part/intel-cpu-bx80637i53330
ram=http://pcpartpicker.com/part/gskill-memory-f312800cl9d8gbsr
and do i need to upgrade my psu for this video card
http://pcpartpicker.com/part/zotac-video-card-zt6090110m
ram=http://pcpartpicker.com/part/gskill-memory-f312800cl9d8gbsr
and do i need to upgrade my psu for this video card
http://pcpartpicker.com/part/zotac-video-card-zt6090110m