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Indeed, some of the 6800 cards also run OpenGL2 and DirectX 9.0c Shader Model 3.0 and alot of 7800 features too! and with some overclocking, clock and memory speed can reach those of 7800 cards!

 

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I think that AGP's time is getting soon over since you can get the same cards with pci-e but much cheaper and with higher core and memory speeds! Maybe AGR slots will build its way up since they are 64bit compatible.