don't need 512bit bus its why 4870 never really gained much of a boost even with an extra 200mhz + on the memory overclock hasnt saturated it yet.. I think there eventually will be a 5890 possibly with 512 if not then next series after the shrink might be..
also memory will be at 5300 mhz so nice mem speeds just to make sure its not going to fail with it....
you act as-if its the same core as the 4XXX series its not its like double everything pretty much so even at 850 it's impossible to compare as its a diff chip entirely
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