I just recently upgraded my graphics card to a Geforce 6600 GT, but when i installed it i got the message that due to lack of power it would run at lower performance to prevent hardware damage. I assumed it was my power supply because it was quite old, and i couldn't remember how many watts it put out. I bought a 520 watt power supply, probably over kill i know, but i continue to get such a message. Is the VGA card at fault? Its in the AGP slot.