Motherboards for PC-1200?

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Is PC-1200 RDRAM unofficially supported? I've checked several of the top motherboard manufacturers' websites, and none of their specs pages mention support for PC-1200 RDRAM, only as high as PC-1066. I know that you can use overclocked PC-1066, so I assume that PC-1200 would work just fine. But would I need to look for anything special in order to use PC-1200 RDRAM in a system? And, is it even worth the extra cash? (256x2 PC-1066 ~ $240; 256x2 PC-1200 ~ $290) Thanks in advance for the help.