1. That power supply is a badly designed and constructed power supply. It is also getting old. Two good reasons to replace it.
2. That power supply is rated to be a 400w power supply but the specs only list ~350w. You would need to be careful, even if that power supply were new, on how much you pull from it. Now that it is aged, I don't recommend anything.
3. You will need to ensure that you have the proper plug for your video card, on that power supply. If not, then you will need a new power supply.
4. The 2 graphics cards you listed show 55w and 60w respective usage. With a computer system running around 200-250w that doesn't mean much room for that power supply. Since that power supply is older, it isn't going to output enough. I would, again say that you need another power supply.