Have you thought about going this route – leaving the iMac intact but booting from an external modern ssd drive? 2017 27" iMac: More memory vs. external boot SSD? - Hardware - MPU Talk
Have you thought about going this route – leaving the iMac intact but booting from an external modern ssd drive? 2017 27" iMac: More memory vs. external boot SSD? - Hardware - MPU Talk