You have a Phenom II; it's going to struggle with most games. Most AMD processors (very few exceptions, all extremely new and of a new type) are not good for dolphin. I have a Phenom II-based Athlon II, and can tell you that MKDD will not run so much as acceptably. If you want, you can try overclocking, but it isn't the easiest thing to do on non-BE Phenom IIs, and the required method can wreak havoc on your motherboard, not just your processor.
in a perfect world we would all be piles of sand with no ability to form coherent bodies of body