Macs Able to Run macOS Sierra Remain Compatible With High Sierra - MacRumors
Some Users Report macOS High Sierra Gives Old Macs Better Performance - The Mac Observer
Identify your iMac model - Apple Support
My free iMac 27" (2009) core i7 2.8, 32GB, 1TB SSD High Sierra. only cost me a SSD and about an hour of time. : r/mac
Amazon.com: Bootable DVD DL for Mac OS X 10.13 High Sierra Full OS Install Reinstall Recovery Upgrade
Apple iMac 27″ Late 2009 Core i7 2.8GHz 8GB 500GB DVDCDRW Wifi macOS 10.13 High Sierra – Refresh Computers Online Marketplace
iMac 27" 2.8GHz (Late 2009) | mac of all trades
Early 2009 duo core (square mac) now running High Sierra patch from Dosdude1 flawlessly. : r/mac
High Sierra 10.13.6 For 2009 Mac - skieyaplus
Here are the Macs that can Run macOS High Sierra - The Mac Observer
iMac (late 2009 w/High Sierra) RAM question | MacRumors Forums
5 Things to Know Before Upgrading Your 2009 or Later iMac
Amazon.com: Bootable DVD DL for Mac OS X 10.13 High Sierra Full OS Install Reinstall Recovery Upgrade
IMac 21.5-inch Late 2009 - Mac OS High Sierra 10.13.6, Intel Core 2 Duo, 4 GB DDR3 RAM, 500 GB HDD, Nvidia GeForce 9400 256 MB VRAM
Use your iMac as a display with target display mode - Apple Support
MacOS High Sierra Compatible Macs List | OSXDaily
iMac Late 2009, my experience using it in 2021 with OS High Sierra - YouTube
