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"If GeForce GTX 680 does in fact end up competitive with AMD's Radeon HD 7900 series, it could serve as a tell-tale sign of NVIDIA's Kepler architecture being a more efficient one"
thats an over statement, cuz as far as GCN is concerned, the most efficient chip is the pitcairn
tahiti on the other side is a disapointment when u compare it with pitcairn, which has 40% more cores yet performs barely 20% better
considering both are the same architecture it means tahiti is bottlenecked somehow, or amd is holding something up its sleeve
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