The Radeon HD 4850 series is CrossFire/CrossFireX supportive, which soon will work with their proprietary Linux driver. CrossFireX allows up to four Radeon HD 4850 graphics cards to function together and share the rendering workload.
The connectors on this graphics card include two dual-link DVI and the third connector is for use with TV/HDTVs. The included adapter allows an HDMI interface to be used from a DVI port, which also supports using the GPU's integrated audio processor. The 7.1 channel HDMI audio is supported under Linux with ALSA. In the event you need a VGA connection, there is also an included adapter that will occupy one DVI port.
While the Zalman VF900 heatsink should be enough to keep the graphics card and memory cool while overclocking, there are all of the holes in the PCB needed for other RV770-compatible cooling solutions.
Below is a picture comparing the Sapphire Radeon HD 4850 Toxic 512MB graphics card to a Diamond Radeon HD 4850 512MB. For more on the RV770 architecture, check out our ATI Radeon HD 4850 and ATI Radeon HD 4870 reviews.