I'm afraid both these cards are sub-par quality and you won't be able to turn self shadow on at all in game. These cards value 30-40 dollars and are probably 4-5 years old architectures.
Are these included in some branded computer package? I would try to find a way (a friend or DIY) to build my own box instead. Branded cheap computers contain huge compromises, old hardware and lowest quality components. Even though they may seem cheap they're generally speaking a waste of money in the long run.
A friend of mine bought a box 'cheap' even though I warned him not to. I offered to put a box together for him.
Well, he bought the box. 6 months later he bought a game that wouldn't run on it. Turns out he had to swap the power supply and the displaycard for new ones bringing up the total cost to 30% higher than what he would have paid if I built the proper box straight away. He also had to mod the case and add ventillation for the new GPU as it overheated the box. And still he's stuck with a crappy motherboard with no overclocking options and a budget cpu. I pointed my finger and did the Simpsons 'hee heee!' on him.
