In most cases integrated video, although it sounds cool, is not great at all. If you intend to play games of any calabre, a video card is crutial.
Simple put, there is minimal space on a motherboard for extras like GPUs (Graphics Processing Unit) and complicated video features. While when installing a video card, this new bit of plastic and silicon is the only limitation.
as far as word processing and solitare are conserned, any integrated will probably do now-a-days. Depending on how new your motherboad is, the x300 may not have been a huge upgrade, but it does give the mobo a little bit of a break having more memory (on the video card) to handle it's own processes.