Hello, I have C2D 2.93 GHz CPU with 2 GB DDR3 runs in I-Ball 400W SMPS. Now I am planing to add GPU for gaming. I have a budget of 5k for that. So tell me which GPU i can get with good gaming performance ATI or Geforce. And also tell me for if the GPU needs much power, so which SMPS you will prefer for that with in 1K.