The 450W power supply can run a Titan if need be and the case will house up to 9.5" cards without mods. The SG05 only takes a slimline optical drive, but can take a 2.5" and 3.5" hard drive as standard.
IF you get a bit creative with where you place things, you can fit a lot more inside. For instance, I have a Titan, 2x2.5" drives and a H60 watercooler in my SG05, and could probably squeeze in another 2x2.5" drives if I wanted. And all it took was a minor cut into the front.
Great little case.