Can memory modules with different refresh rates or counts be intermixed?

For first generation Power Macintosh computers that require SIMMs to be installed in pairs, the two SIMMs within a pair need to be identical. Other pairs can have different supported refresh rates. DIMMs with different supported refresh rates can be intermixed.

But if it's intended to enable memory interleaving, DIMMs with different refresh rates may or may not have DRAM devices with same addressing modes. Note: DRAM devices require the same addressing mode to enable interleaving. More.

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