For all of the ten people that care, I installed High Sierra On a mid 2009 MacBook Pro : r/mac
iMac 24" 2.66GHz (Early 2009)* | mac of all trades
iMac "Core 2 Duo" 2.66 20" (Early 2009) Specs (Early 2009, MB417LL/A, iMac9,1, A1224, 2266): EveryMac.com
21.5” iMac 2009 for Sale in Long Beach, CA - OfferUp
PSA: macOS Sierra drops support for many Macs from 2007, 2008, and 2009 | Ars Technica
How to install macOS 10.12 Sierra on unsupported Mac hardware
Identify your iMac model - Apple Support
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macOS High Sierra On A 2009 Imac Core 2 Duo? A Retro Adventure :o) - YouTube
Apple macOS Sierra: how about that compatibility list? | Mac mini, Latest macbook air, Apple
Apple iMac 21.5-inch 3.06GHz Core 2 Duo (Late 2009) MB950LL/A | mac of all trades
Preparing a 2009 MacBook for macOS Sierra - YouTube
The MacOS Sierra Compatibility List | OSXDaily
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iMac 2009 21.5” Core 2 Duo 3.06GHz 4GB RAM 250GB HDD High Sierra FHD GeForce | eBay
10 Things You Need to Know About macOS Sierra | PCMag
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Apple updates iMac and MacBook lines, launches MacOS High Sierra: Digital Photography Review
Retro Review: 2009 Mac Pro in 2022 | iMore
Installing MacOS Sierra on an unsupported Mac (2009 MacBook Pro 5,4) - YouTube
Apple iMac Core i7 8GB Computers | MD063LL/A | Discount-Computer.com
