Bev,
I'm in the process of installing the CX500 PSU into my 4600, but I cannot figure out which connector goes into the P2 connector (J5B1). There motherboard power connector is a 20+4 type, but the +4 isn't able to reach the P2 connector. In addition, I see two additional connectors off the PSU that each have a 6 pin connector plus a 2 pin connector.