Not too sure about that, considering most GTX780's (except for reference) standard boost clock is above the core clock of the stock clock of the 290.
I have no idea as to the clocking potential of the 290 out the box - however my 780 boosts to 1188 out the box goes upto 1300 within the normal voltage range allowed and is a distinctly average clocker compared to 780s as a whole and thats not a terrible result compared to GPUs in general. (Reference boost clock being 900MHz).
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