Kyle,
Let me make a suggestion to you. Take your Sonnet Tempo-X 8-port ESATA card out and see how your machine works without it. If its not any better you can rule that card out and move on to the next component you added and take that out and test. Use a scientific approach and eliminate whatever bad component(s) you might have installed. You may have also installed a bad memory module, and each of those should be ruled out. If you can’t ID a bad compenet then maybe you have a bad motherboard and you’ll have to bring the whole thing back to wherever you bought it.