I'm wondering if the 20" ATI 2600 will work in the same year 24". I realize the heat sink will need to be swapped. Which might be a good idea to improve the thermal tape & paste.
What you may not realize is...I'm pretty sure the 2600 in the 20" iMac is not removable.- Nick
Anything is removable Nick, when you use a 300W soldering gun. ;P