Under the Doom 3 Engine, the integrated chipsets went down face first off the high dive platform. Since the vertex processing is handled on the CPU, the intensive vertex processing showed itself to be too much for the CPU and data buses. The entry-level discrete cards had no problem doing five to six times the number of frames per second.
Best fit solution? Not for any real gamer.
We let the game determine the best fit for the integrated solutions. The game determined that a medium detail level at a resolution of 640x480 would be alright for both integrated platforms. However, the 18-19 frames per second that we got for performance begs to differ.