that strange why would they underclock rev a imac
but now all of the sudden it overclocked memory 30 mhz more....
my imac core duo 17" cannot handle 416.5 core without getting arafact. for the mem i can go like 530 mhz clock but i set it at 468 like the ati recommended setting it posable apple set the imac core 2 duo 17 in at 470 mem or less and core max 416.5 mhz