well 280 was 600, and 285 was 650 ref clocks...
i think they will be more around 600 than 650...

fully enabled? i thought even their server parts wont have all units enabled?
and they seem to be heat limited... a lot... unless they have perf issues and cant beat an overclocked 5870, which would surprise me a lot, i dont see why they would go at great lengths to clock their cards high and run into a lot of heat and power complications... not really worth it i think...