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DDR3 Routing - Registered DIMM vs Unregistered DIMM

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Because Registered DIMM uses extra Buffer/Delay chip because of that Controller won't see much loading effect of the memories. Data transfers will be reliable.,
 

Because Registered DIMM uses extra Buffer/Delay chip because of that Controller won't see much loading effect of the memories. Data transfers will be reliable.
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This is all very good.
But WHY does it necessitate a different routing scheme than simple un-buffered DDR3 ?
 

Because REGISTERED DIMM involves extra chip --> So, traces will go to this Chip as input and output may be 2 sets will be transferred to different sides.
 
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