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Well according to every spec I can find the only hz is even mentioned as a guaranty is 60hz. I know in the past I have seen people make your same complaint at 120 & 144 hz. So I would say that any support at common resolutions is likely support added in beyond what was originally specified. I don't know that 240hz monitors even existed back when those cards were released.
You could try to create a custom resolution with CRU and see if that helps. Custom Resolution Utility (CRU)