I have had my custom rig for around a year now with an atrix extreme power supply (650w). I decided to go out and buy another nvidia BFG 9600gt graphics card since I wanted to use SLI. My only problem is that my power supply only has 1 6 pin peg connector and I will need 2. Does this mean that I would need to go out and buy a new power supply or is there an adapter or something that I can use?
I just had a look at a review of your PSU & it has two +12V rails with only 14A & 15A on them - click here, page 3.
I don't think your PSU is capable of running 2x 9600GT cards & an adapter/converter as suggested by sunnystaines is not recommended. On the other hand, I could be wrong but I wouldn't chance it. If it was a quality PSU, then perhaps yes.