CrazymanWO :
This is my setup:
AMD fx 8350
gigabyte 990FXa-ud3
8gb ram
EVGA gtx 670 FTW
700 watt powersupply
My question is will my 700 watt psu be enough for this to add the gtx 550 ti?
Also the link you sent me the description is not very good. Will i have to connet the SLI wire to both cards if im making the 550ti the deticated psychx card?
What brand is your PSU? It should be fine if it's a good one.
No, you don't se the SLI bridge for PhysX setup. Just install the 550 and go to the Nvidia control panel, and select it as your dedicated PhysX GPU then you should be good to go.