No matter what graphic card is reported, proof is in the pudding.
MacWorld lab tests show the Nvidia GeForce 7300GT 128MB BEAT the ATI 2600 Pro 256MB in UT 2004 frame rate test. Sure, the results were close (less than 2fps), but I'd expect, after an entire stinkin' year of NO updates, for Apple to put in a graphics card that
at least showed some improvement in 3D. No wonder we have no pretty charts showing the graphics on Apple's iMac website.
That would mean the optional Nvidia GeForce 7600GT 256MB in the previous iMac 24" would really kick some ATI 2600 Pro butt.
Sorry to pop all of y'all's bubbles.