I have a MB ASus P5Q premium (intel P45) , 8800 GTX XFX , q9540 with Creativ X-FI sound... I experience sound crashing.. one time the computer on reset doesn't boot up (I had to switch the PSU on/off) , I had graphical artifact one time and crash... , and after another sound crashing the BIOS got reset. All of these totaly random once per 3-4 hours, only when i play intensive CPU/GPU games. I started with these when I upgraded the CPU and the MB. My PSU is noname 500W. Should I change the PSU with one of 650 W ? these are signs of not enough power from the PSU ? Thank you.