How many slot does the Radeon HD 5770 Powercolor take? Link inside?

How many graphics card kinda slots would this take? Right now i have a Geforce 8500gt in my comp that i put in a few years ago, im making a huge upgrade with this but im pretty sure i only have that one graphics card slot in my computer, because the second one has an integrated card in it. I THINK. Will this be able to fit? http://www.newegg.com/Product/Product.as…|||You can see on picture on first link that is has 2 little hooks on the left side that mean 2 slots!