The other question is what PSU would run 2 of those video cards on this system?
Thank you for any help!
Your current PSU should be able to run your setup with a single GPU. I am not familiar with the quality of the Ultra brand so I can not tell you if it would be a good idea or not. When you upgrade for the SLI, look at a quality PSU from Corsair, PCP&C, Enermax, Seasonic or the Antec Earthwatts line.
Is there any danger if it cannot run my current setup or will it just not turn on?
If it is unable to power your system, odds are it will randomly shut down under a load. If you continue to overload a PSU, there is a good chance that it will fail and, in doing so, send a voltage surge to one or another of your components. The PSU is one of those components you never want to skimp out on.
Well that does not sound good. I guess I will try booting it up and see how things go and if it shuts down even once I will upgrade. Was looking at this -