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the g80 core can only do 1 thingy(bit or whatever it does) per a stream proccessor
the r600 core can do 5 thingys (again have no idea what its called) per a stream proccessor
the g80 has 128 real life stream proccessors
the r600 has 64 real life stream proccessors
128x1=128
64x5=320
the r600 core can do 5 thingys (again have no idea what its called) per a stream proccessor
the g80 has 128 real life stream proccessors
the r600 has 64 real life stream proccessors
128x1=128
64x5=320