Hi there guys! My brother is looking into a memory upgrade for his 24" iMac. His is the white 24" with 2.16ghz. I believe after Googling around, it's a MA456LL model. He upgraded to 2gb with nVidia 7600GT. He's now doing more and more stuff with his computer and sometimes it hangs up. He is still running on OS 10.4.11. We noticed that with barely any apps open, he has around 500mb of RAM free. So I think he needs more. The max I believe on this computer is 3gb. So I'm planning to get another 2gb of DDR2 PC-5300 667mhz from corsair. Anyone have any suggestions or comments on the RAM or suggest another brand that will work well with the RAM installed from Apple? Any input is appreciated, Thanks!!!