It would be great than Garmin communicate about the CPU used in there watch.
is it the same cpu in both enduro and fenix 8 watches ?
its seems it isnt.
Here the difference I have gathered between Enduro 3 and fenix 8 51mm solar :
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no Dive feature
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no mic and speaker
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MIP display
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No more additionnal strap in the box
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not the same case :
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Enduro 3 is thicker by 0,3mm
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Rear cover is fiber-reinforced polymer and not metal. Enduro 2 is metal
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No Inductive buttons. (sad)
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Thus the case is 10g lighter than fenix 8.
Speculation :
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Better solar panel or more efficient hardware
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less powerful cpu ? > less accurate HR data than fenix 8 and more battery life.