I have an iMac 7.1, Penryn CPU T9500, 6 GB DDR2 RAM, SATA SSD with El Capitan. Do you know whether the iMac 7.1 would run with a quadcore CPU Penryn Q9000 or Q9100?
The problem with the Q9000 and Q9100 is they need a front side bus (FSB) of 1066 MHz and the T9500 is FSB 800 MHz. That's going to be the limiting factor here. All the quad core PGA478's need that higher FSB.