For ARM64 performance, if you don't mind a desktop instead, there's https://www.phoronix.com/scan.php?page=news_item&px=ADLINK-Ampere-Altra-Developer https://ww

For ARM64 performance, if you don't mind a desktop instead, there's https://www.phoronix.com/scan.php?page=news_item&px=ADLINK-Ampere-Altra-Developer https://www.phoronix.com/scan.php?page=news_item&px=ADLINK-A... with a 32-core Altra A1 in it including RAM for 4000 USD. It is very reasonable when compared to a Threadripper. In terms of power efficiency you'll need to wait until Apple stops monopolizing TSMC's N5 node. Apple almost singlehandedly invented the ARM64 ISA, and bankrolled the leading-edge TSMC process, so it's probably okay for them to have the best SoC for a while as long as others have a fair chance of catching up soon.