Way to be Apple. Way to be. Skimping a few cents on an Ethernet controller for your higher end prosumer computers. The other iMacs released this cycle have NIC controllers with jumbo frames. Heck, even my original 20" 2.0GHz Intel iMac had jumbo frames, as did the gimped 24" iMac 2.66GHz 9400m I sold a few weeks ago. Seems like with every iMac there's always a slight niggle that prevents it from being a perfect machine. Aside from all the issues with mine (which will be rectified soon) and others, I'm forced to quote Nancy Kerrigan with a resolute "Why?"