Over at LowEndMac, Mark Sokolovsky has documented a wild upgrade to white plastic Intel iMacs:
A little known secret is hidden inside every early intel iMac made by Apple prior to their 21.5″/27″ transition… they all have a Mini-PCIe slot! While many upgrades have been documented/discovered for these iMacs, and GPU upgrades have been attempted as well, few eGPU solutions have been presented as viable, or have been documented.
In this article today, the examples we’ll be using are my 2007 20″ iMac, as well a 20″ Early 2006 iMac. The ’07 iMac had been upgraded to sport an AMD XFX RX 570, with full graphical hardware acceleration, under macOS Monterey! The theme here is promoting the longevity of devices deemed otherwise obsolete. Whether or not a device is obsolete is subjective, and this opinion lies with us.