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Sierra on Core 2 Duo 2007 iMac??

Simon Night

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Hi All, 

I have an iMac 2007 with a core 2 Duo. I have upgraded it from 1 gig of ram to 4 gigs. I have been able to update it to El Capitan, but I can't seem to update it to Sierra. Many are saying I can't because the hardware is not supported, but others are saying I can. I have tried a boot disk with Sierra and it just gives a circle with a cross through it. 


Are there any tutorials that you could suggest? I dont have much money and I live where I can't get great access to the internet consistently so youtube tutorials are not always easy to watch. 


Any ideas? 


Thanks again, Simon 

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macOS Sierra (and later) requires a CPU with SSE4 instructions set and this was introduced in late Penryn/Wolfdale C2D generation. All 2007 iMac models were based on previous Merom generation which do not possess those SSE4 requirements so El Capitan will be the end of the line; 10.11 remains perfectly usable today though. By all means, identify your exact CPU and/or iMac model to confirm the situation.

Edited by Hervé
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