Address Decode Space?

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I have a Mainboard with four RDRAM slots.

The Mainboard will support a maximum of 2GB's RDRAM.

The Mainboard has a maximum DRAM Address Decode Space of 4GB.

What does it mean to have an Address Decode Space twice that of the physical
memory supported?

Could I have a configuration of 2 x C-RIMM + 2 x 1GB Module?

Would the above configuration start at address 0x80000000?

Any explanations received with thanks.


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