When it comes to Blu-Ray playback it is clear that discrete graphics cards like the Radeon HD 4830 are the way to go as they offer 62% to 74% less CPU usage and the playback is smooth as silk. The Intel DG45ID motherboard with X4500HD onboard graphics did very well and only in certain movies with panning wide angle shots would you catch a stutter or two that are smooth when using discrete graphics. An example of this is the H.264 title Iron Man during the hostage scene where the camera is pulling back from a close up of Tony Stark tied to a chair with terrorists around him. When the camera pulls out you can tell that it's not smooth and little things like that can ruin a Blu-Ray movie, but I only caught that when using the system for a few days with each graphics solution. Integrated graphics are coming close to perfect Blu-Ray playback, but with dual-decode (PiP) and other features becoming popular the best way to go is still discrete.