I'm going to bet £10 on 48 CUs @ max 2.0Ghz on release hardware. Max because developers would be able to balance GPU frequency with CPU frequency according to needs, in order to maximize performance per watt, rather than running everything at full tilt. Usage of fast SSD storage could help mitigate performance impacts of doing this on the fly. Expecting developers to rarely use the 2.0 GHz outside of in game cutscenes where CPU is less busy. Average in-game clock would be 1.6Ghz. Do I have any source? None whatsoever