The Most Comprehensive AMD Radeon Linux Graphics Comparison

Radeon HD 5770: Becoming more relevant to consumers is also GPGPU computing on modern graphics processors. Unfortunately, this is another troubling spot for open-source drivers. The Catalyst driver does have OpenCL / Stream support when installing their Stream SDK, but the open-source Radeon support is currently nonexistent. There was some work on the OpenCL state tracker for Gallium3D this summer, but it is not yet ready. There has also been some Nouveau GPGPU computing support by PathScale, but nothing in the land of Radeon graphics cards. There's been much open-source GPGPU interest building recently, but I would suspect it will be another several months before there is possibly experimental support ready and a year or more until it's actually deployed and available to most users. The Radeon HD 5770 has an 850MHz core clock and 1200MHz for its 1GB of video memory.

Radeon HD 5830: For those wondering about the various display ports on modern Radeon graphics cards, they should be supported with recent Radeon DRM for kernel mode-setting -- DisplayPort, and HDMI, including the mini connectors for both DP and HDMI. Radeon HD 5000 series and newer has the Eyefinity support for driving more than two displays simultaneously. The open-source Radeon driver supports this feature in theory, but I have experienced mixed results when lighting up more than two displays simultaneously on different Radeon graphics cards. This Cypress LE graphics card up for Linux benchmarking was at 800MHz and 2000MHz for its 1GB of 256-bit GDDR5 video memory.