I have asus p5kpl am-in motherboard and i am currently usingintel pentium d 820 processor which was originally 2.8 ghz but after overclocking its 3.2 ghz but my question is can i install any better processor on my motherboard because i have don't idea which processor will be compatible and can i use any amd processor ? My second question is that is it neccessary to have pciex16 port to install graphic card?