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4K compatibility?

CES 2013 show cased some nice 4K or Ultra HD TVs, which got me thinking. 

Many Av amplifiers/receivers and 4K projectors state they can receive or pass through 3840x2160 signals at 24/25/30hz and 4096x2160 at 24Hz only. 

Does this mean that they wouldn't be compatible with 50/60hz signals at 4K res?