First, there is a difference between architecture and implementation. The reference standard implementation of the architecture that anyone with some money can get from ARM (the company) is skewed low power. However, folks can also buy an architecture license and do their own "bottom up" implementations. Apple has one of these. That doesn't mean they are trying not to go in general direction that ARM is going in.
However, folks could go a very separate way. ( Which actually hasn't worked out so well for vast majority of them. It has been a slow slog. For example getting a real, support Linux server distro up and running all the way through support validation/qualification stages. ).
https://www.nextplatform.com/2018/05/16/getting-logical-about-cavium-thunderx2-versus-intel-skylake/
[ This article also mentions Ampere ]
Some peaks at power (note: this is the system consumption ) .....
"... Our Gigabyte/ Cavium ThunderX2 Sabre development platform hit a peak of 823W at 100% load. We think that there are likely optimizations that can occur at the system’s firmware level, and by using GA power binned chips. At first, we thought that these numbers were way out of line so we discussed them with Cavium and that is when we were told that the ~800W range was correct for our system and pre-production chips. ..."
https://www.servethehome.com/cavium-thunderx2-review-benchmarks-real-arm-server-option/8/
If go to the first page of that article you'll see a change where the top end Thunder X2 has a TDP of 180W. For 64 cores you'd need two... so 360W just on CPU . That's isn't low amps. It is also way off the ARM reference implementation (e.g., 4 way symmetric multi-threading (SMT) . Apple has about
zero SMT. )
Anandtech ran some benchmarks on a Thunder X2 system also. ( it is decent for some stuff. A single user workstation ..... in most case probably not. It isn't what is it built for. )
https://www.anandtech.com/show/12694/assessing-cavium-thunderx2-arm-server-reality/
Ampere's eMag system was benched over at
https://www.phoronix.com/scan.php?page=article&item=ampere-emag-osprey&num=1
( TDP of that CPU is in the 120W range. )
Are you talking about stuff from this era ??? (2011 )
" ... “ARM microprocessors are designed for lower performance and unlikely to match x86 performance in the next few years,” Kanter said. ... "
https://www.macworld.com/article/1159856/macbook_arm.html
Which was and is true. At this point, we are more than several years past 2011. However, it is
EXTREMELY illustrative of just how
long this 'echo chamber' has been clamoring that Macs are going ARM just around the corner.
Not really. Apple is more than several years away from that point. But they aren't the only ARM implementors out there. The several implementations have mainly been designed for different workloads. They could be shift but highly debatable whether there is a reasonable sized market there to justify the expense. Just the server stuff has been problematical in terms of volume and reach with available OS base options.
On which benchmarks? The notion that ARM servers were going to wipe the x86 servers from every task in the Data Center and in HPC envrionments in a couple of years ... yeah that's mostly hooey. High users , high latency ( due to concentrated workload) tasks they do work. But that isn't a single user workstation context for vast majority of workstation users.