Its not that simple. The card you are using needs a constant 30amp supply.
You have to work out what is on the same rail as your Molex conectors. Some cheaper PSU's will bundle them all together, As for the most part items on Molex connectors do not draw that much power, HDD's DVD drives.
This is why it is better to buy a power supply that has the necessary plugs on it, as you can be certain that each of those 6pins on the PSU will supply at least 40amps.
Now from what I can see of your PSU none of the MAX amps get near to the 30amp range. Without having a clear breakdown of the PSU I am unable to tell if all the molex connectors are using the same rail. If so then I doubt the PC will even start up. Or it will beep at you telling you there is not enough power for the GPU. And possibly causing the PSU to go kaboom, and thus I would advise against using that PSU. You should never have to use a molex connector. It is very rare for a GPU to come bundled with them anymore as new cards just arnt able to run off of a Molex adaptor.
I would advise you strongly to go and spend $40-50 on a half decent PSU. that has the right connections. If im not mistaken When I built Highlanders first PC the 600 watt Corsair PSU had plenty of punch and two 6pin PCIe cables.