Picked up this thread from Electronista.com saying they had confirmation that the CPUs in the new iMacs were not Montevina based but overclocked Santa Rosa Penryns...
http://www.electronista.com/articles/08/04/28/imac.cpu.origins/
[apologies if this has already been posted elsewhere!!]
http://www.electronista.com/articles/08/04/28/imac.cpu.origins/
[apologies if this has already been posted elsewhere!!]