An Open-Source Radeon HD 4670? Sort Of.
The kind folks at Sapphire Technology had sent out the ATI Radeon HD 4670 graphics card upon its release. The Radeon HD 4780 retails well under $100 USD and has 512MB of GDDR3 memory with a 128-bit interface.
We were successful in using the Radeon HD 4850 with an open driver and HD 4870 since most of the architectural changes between the R600 and RV770 are hidden behind the AtomBIOS interface. AtomBIOS is the video BIOS abstraction layer that was designed by ATI and has been implemented within their graphics cards since the R400 series. AtomBIOS itself isn't open-source but their parser is available and most recently they had released a new version.
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