My computer has been acting fairly erratically lately. During fairly intensive scenes in my videogames, such as near the end of a heated race of Need For Speed: Most Wanted, or in an espescially packed scene in World of Warcraft, my computer will start spuriously beeping from the PC speaker, not even from my real speakers. I'm not quite sure why this is happening, but I'm thinking it has to do with heat as it only happens when I'm working my computer fairly hard. I know my processor isn't overheating as MBM says that it's at 56C, which is hot, but not that terrible. I don't really have any way of checking the temp on my vidcard, but I'm pretty sure that's the problem, I'm just looking for other opinions as to what it might be. Here's my system specs: Athlon 64 4000+ cooled w/ Thermaltake XP120 Asus A8N-E Corsair TWINX 1024 PC3200 XLL (2-2-2-5) ATI Radeon X850XTPE (stock cooling) HDs: 2x300GB (not raid) + 80GB + 30GB Coolermaster Wavemaster case w/ most fans swapped for Arctic Cooling TC3 fans Antec NeoPower 480 (I'm thinking that 480W is enough for this system) So also, if it is the videocard overheating, should I swap out the cooling for an Arctic Cooling ATI Rev 5 unit, or should I buy a new 7900GT (I can get it at cost from Dell)?