A friend of mine has a Dell Inspiron 530 Desktop Computer (Intel Pentium Dual Core E5200, 500GB HDD, 2GB) and wants to put a SAPPHIRE 100245L Radeon HD 4850 card in it. This would require us to put a different power supply in the system to support the card. I know we need two SATA connectors to get his hard drive and DVD powered, a 6 pin PCI express to power the card, and of course your standard 24pin connector. I noticed there was a 3.3v live that was a 4 pin that plugged into the board in a second place I do not know what that is. It is labeled as P2. what do I need to know guys? what can I do to help my friend get a reliable 450w with everything he needs?