I recently purchased a mac pro with the default GeForce 7300GT. I opened up the case and realized that there are no power cables hanging out anywhere. I know that all high end cards like the GeForce 8800GTX need power to them. I searched on google about upgrading how to get power to these cards if it is possible but it yielded no results. Does anyone know if it's possible to get power to a GeForce 8800GTX if I wanted to upgrade?