Gathering information on an upcoming motherboard replacement in a Dell Denension 2400. Went to Dell website to get system config data, okay. The system is still up and running so I am trying to identify the cpu socket in order to get the parts before tearing it down. The part description identifies the processor as follows: Part # F1534 Processor, 80532, 2.53, 512k, 533, SKN, Decision One In that I can see 2.53GHz, 512 L2 Cache, 533 FSB; so I know its a Intel chip because of the 533 FSB. What I don't know and Dell Tech cannot seem to tell me is whether it is a Socket 478 or an LGA775. I know Intel produces most of the LGA775 processors in 800 FSB but there were a few sizes in 533 FSB, and it would be my luck to order the wrong one. Can anyone assist with identification of this processor socket? Thanks in advance.