I have recently built this system with fresh format and installation. Now after video encoding or gaming (1hr or more), the CPU usage jumped to mid 40% and many system functions would stop responding. Currently running softwares also stop responding along with on/off/restart/standby. I've read from various forums that this is due to the dual core not being able to communicate with each other and leads to continuous loops. Some said that it was due to motherboard and ram incompatibility. Please look at my system spec if you want to know it in detailed. I checked with Window support and I was supposed to insert "/usepmtimer" to the boot.ini file. However, that did not help. This system has no virus or spywares. I checked it with Trendmicro. If anyone knows something, please share your thought and knowledge. Thanks.