There are two versions of the GeForce GTX 295 card. One card version has two DVI and one HDMI connectors, the other version has two DVI connectors. The card with two DVI and one HDMI does work in Surround (2D) since it has three connectors.
You can also pair two GeForce GTX 295 cards in Quad SLI mode and work with 3D Vision Surround mode in a future driver update. However, please note that in the first Beta driver for 3D Vision Surround, we do not recommend running GeForce GTX 295 Quad SLI because there are bugs in the driver which may result in system instability. We will be providing a future driver update to support this configuration.