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Replacement of C4-0466 thermostat

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looking for a most up to date thermostat than my old C4-0466. I found on the Honeywell web site the RTH9580WF and the RTH6580WF. 

I am not sure witch one will do. Or may be a third one. 

My old C4 has a 3 wires and the RTH above seem to have 5 wires. 

Any help ? 

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