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the 6800XT is not 64 bit, 64 bit is only usable when you have a 64 bit capable cpu(which you clearly have with that beastly processor) and Windows x64 edition
If you don't have Windows x64 then you will be running your desktop in 32bit which is currently better since it is harder to find drivers for 64 bit and most applications are still 32 bit by default
The 6800XT has a 256 bit memory bandwidth interface
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