Hi I am using a MSI motherboard model K7N2G-L. CPU is athlon 2400Ghz. Memory 1GB (kingston 512 x 2). graphic card is Albatron Ti4200 with 128mb. I'm already using this PC for almost 3 years now. the recent upgrade i did on my pc is adding a memory module Kingston 512MB to make a total PC memory to 1 GB. One week back i replaced my motherboard BIOS battery and redid the BIOS setting again. No overclocking was done. currently i'm having a problem. when i'm playing graphic demanding games like NFSUG2, there is a warning and beeping sound from PC Alert 4 (ver 188.8.131.52). The warning comes from voltage 3.3volt display. i was noticing the voltage 3.3 goes below the threshold setting. as minimum as 2.6volt. but mostly it fluctuate heavily between 2.7 to 3.18. i don't know what causes it and how to solve this problem. when i exit from the game, the voltage goes back normal again. i never had this problem before the changes. i have even played that game in my PC before without any problem(before the recent changes). Temps during idle are about 64 C for CPU and 49 C for Motherboard, rising to 69 C for CPU and 52 for motherboard during gaming. please help me solve this problem. thank you.