I have an Asus A8N-SLI Premium and i just bought my second 7800GTX for an sli configuration. I have an Antec TPII 550watt power supply that is SLI ready and it is a 24pin atx power connector. Do I need to plug a 4 pin power connector into the EZ Plug space on the motherboard? It says in the manual that that is only if you are using a 20 pin atx power connector. I just want to be sure. Thanks!