AMD swaps Zen 4 cores for Zen 4c in two new entry-level laptop APUs stating 'no human being would ever know the difference'

pcgamer.com:

Having already leveraged the smaller, optimised Zen 4c cores in its EYPC server CPUs, AMD is bringing its latest technology to the world of budget laptops with two new Ryzen APUs, sporting up to four Zen 4c cores next to two Zen 4 cores. The compact cores aren't AMD's version of Intel's Efficient-cores introduced in its hybrid Alder Lake architecture, though, and AMD is certain you won't notice any difference between them.

Up until recently, no matter what AMD CPU or APU you used, the processing cores inside them were exactly the same. From the hulking 64-core EPYC 7742 down to the tiny four core Ryzen 3 7440U, each one used the same chips to handle all of the number crunching. That all changed when AMD introduced Zen 4c, an optimised version of the Zen 4 design that shrunk the amount of die space required by 34%.

Initially just used to create mega-core CPUs specifically for the cloud server market, codenamed Bergamo, it's now being leveraged to make APUs for entry-level laptops even more compact and energy efficient. At the moment, only two Zen 4c models are being brought to market: the six core Ryzen 5 7545U and four core Ryzen 3 7440U.

These will displace the current Ryzen 5 7540U and Ryzen 3 7440U, but since no laptop on the market appears to be using them, nobody should feel disappointed that they've missed out on the new technology. There's no change in core counts or clock frequencies, but what is new is that the 7545U will be a 2+4 split between Zen 4 and Zen 4c cores, and the 7440U will be 1+3. 

Not that you'd be able to tell, as AMD said in a recent briefing, «no human being would ever know the difference.» This is because Zen 4c is identical to Zen 4 in terms of how it all works. Operating systems,