The G550 is very similar to Matrox´s last spin of the G400 architecture, the G450. It´s pin-compatible with the G450, and it´s built on a 0.18-micron process, with a 256-bit internal "DualBus" and a 64-bit DDR memory interface. Yes, that´s right: 64 bits, and only up to 32MB of video memory. The G550´s memory bandwidth is in a class with the value-market GeForce2 MX, not the GeForce2 GTS. Supporting AGP modes up to 4X, the G550 continues Matrox´s tradition of a full 32-bit internal rendering pipeline. This used to be a big deal, but it´s become standard practice any more.