Is it imperative that I replace the power cable I already have connected to the PSU when installing a new graphics card even if it is the same? That being one 6 pin and one 8 pin power connector. I'd prefer to not have to dig around inside my computer more than I have to since I clearly don't know just what in the hell I'm doing. It would be nice to just get the new card, take out the old one and connect it without hassle.