So i want to upgrade to the 8800 GTS or GTX, haven't decided yet. I am not sure how well it will work with my system though. I have a mid-tower case and a 450 watt power supply and I have heard this beast is power hungry and quite large. First of all, I am wondering if it will even fit in my case. Secondly, the specifications for most of these cards says they require a 400 watt power supply minimum. Do I need to have the extra wattage with my specs? I would rather avoid it if possible. Any input would be appriciated.