yes, all r3xx and r4xx PCIE radeons up through the are supported with the exception of the XPRESS chips.
By "XPRESS" do you mean "computer chipset released by ATI"? (I found it in Wikipedia)
Does it mean that all PCI-Express x300, x550, x600, x700, x800 cards will work with hardware accelerated OpenGL on r300 driver?
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