I have a dell inspiron 580 that im using for gaming.i have a I3 processor but the new requirements for what im doing requires a quad core processor.my local computer repair told me that i couldnt up grade with an I5 and that im stuck with the I3.I had one slot left for ram so i have a new ddr3 on the way so at least ill have 8 gigz of ram which was another requirement,Is the part true that i cant upgrade my processor ?  Thank you in advance