Phoronix posted a review on the ATI Radeon HD 5450 on Linux

While AMD soon will be introducing the Radeon HD 6000 graphics cards, there is still plenty of life left to the Radeon HD 5000 series especially for those interested in open-source support with the Evergreen GPUs finally being supported by the open-source driver stack complete with OpenGL acceleration via a Mesa driver and this support will continue to mature before there is the same level of support for the next-generation Southern Island GPUs in the open-source world. In this article we are reviewing the ATI Radeon HD 5450 "Cedar" graphics card, which is AMD's lowest-end Evergreen GPU but will set you back less than $50 USD.

  ATI Radeon HD 5450 On Linux