Have you even read the first page of this thread, mate? Check it out:Are these any speed upgrades decent over a late 2012 2.9GHz with 8Gb, fusion drive?
To me it looks like a minor bump from my late 2012 iMac?
I've tried to compare my late 2012 top end 21.5" to the new top end 21.5" both with fusion and all I can see is graphic card bump? Is that all?
Looks to be same CPU? Same memory? Same fusion drive?
Inside its ultra-thin aluminum enclosure, the new iMac has the latest Intel processors, faster graphics, next generation 802.11ac Wi-Fi and faster PCIe flash storage.
More details on the first couple of pages.