And 32 extra ROPs.
What rumor says it has another 32 ROPs? That would also imply that it has a 512-bit memory bus, when that has been contradicted even by the leaked reports. The only architectural difference that can be founded even on unreliable reports is that the 980 has up to 16 SMs vs. 13 for the 970.
Since there are no announced specifications, only rumors based on a card nobody has actually seen, be very careful about spreading claims you may not be able to justify.
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