See thats the funny thing, I have the realtek onboard sound setup too, Its a fairly new machine with a newer vid card. I can run games like MTW II at full settings with bloom/shader 2 etc fine. I also run IL-2 and lock-on at perfect settings. What makes me think its a sound issue is in ww2 online when I hop in a tank, spawn it seems the veichles/engine sound or whatever makes my cpu reboot more often. As infantry I can play up to an hour or more, but as soon as I spawn as a veichle, it either resets as I start up engine or a few minutes later on. As somone pointed out earlier its probably a conflict with memory leak and onboard sound cards. I have an ABIT- AA8XE-3rd eye with a Geforce 7900 GT.