I need help fast!!!

I bought a new video card a Sapphire Radeon X1650 PRO. I know how to install a video card, but i don't know what to do with this thick black yellow cable and also I don't know what to do with the adaptor, because I see that it can fit into the graphic card but I don't think that's neccesary and also I got already an adaptor connected to my monitor, but is that the same? Oh and about the yellow black cabe, Í'm not talking about the cable you need to connect to your hard drive and power supply. Also I got a CD do I stll need to download a upgrade from the website and can a 8x graphic card run on a 4x slot? because on the package it says 8x, but I searched about it on the internet and there several links that say (my graphic card) 2x/4x/8x/16x and some 4x/8x http://www.google.nl/search?hl=nl& [...] F8x&meta=. My last question is that wich links do i have to download to upgrade my driver on the ATI website because there more of em.

sorry for my bad english!