I recently upgraded from a 2.4 Ghz SR IMAC to a 2.8ghz one, I had 6gb in the 2.4, moved them over to the 2.8 and they work perfectly althoght it is 667mhz ram rather than the 800mhz. I would rather go with 6gb of 667 han 4gb of 800mhz.
This is the original thread of 6gb in the SR Imac
https://forums.macrumors.com/threads/607076/
This is the original thread of 6gb in the SR Imac
https://forums.macrumors.com/threads/607076/