显卡 ATI Redon HD 6290 Graphics 显存是256MB 是独立显卡吗？

是集成显卡，不过是性能不错的集成显卡，其核心跟独显HD4330M是一样的。下面是一段来自国外网站的资料：

The AMD Radeon HD 6290 (or sometimes also called ATI Mobility Radeon HD 6290) is an integrated graphics card in some Ontario netbook processors (e.g., C-60). It is based on the same graphics core as the ATI Mobility Radeon HD 4330 but without any dedicated memory. Furthermore, it features the newer UVD3 video processor. Compared to the slower HD 6250, the 6290 features Turbo Core to overclock automatically to 400MHz.