I just got a computer that comes with a 305 Watt power supply and I'm planning on getting a XFX PVT45GUDF3 Geforce 6800GT 256MB GDDR3 PCI Express x16 Video Card which recommends at least a 350 Watt supply. Should I bother ordering a power supply and if so should I get a cooling device with it? Is there any danger of overheating if I get a power supply over 400 Watts?