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The Intel 82840 MCH defines space for SMRAM which overlaps the RDRAM space. Does this have to be physically separate memory?

April 26, 2017defines Intel MCh overlaps physically rdram separate

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The Intel 82840 MCH defines space for SMRAM which overlaps the RDRAM space. Does this have to be physically separate memory?

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As stated in the Intel® 82840 (MCH) Datasheet, section 4.1.2, the SMRAM Controller uses the physical existing RDRAM memory space. Any RDRAM memory behind the extended SMRAM space addresses is not remapped and thus not accessible.