Hello thanx to your replay so would 650watt be ok for my set up? I thought i would need to go higher wattage since am runnning 2 9800gtx cards .
650W is more than fine. Just check out how many amps can be supplied on the 12V line, as graphics cards rely heavily on this. Check on the Nvidia website what the amperage requirement is for one 9800gtx and just multiply by two to get how much ameperage your PSU will need to supply.