MacOS X 4K60

asurace writes " gets another first look at a MacOS X build.They write
"After our little iTunes coup earlier today we have barely any energy left at all to devote to writing up 4K60 - the latest OS X build that we've had the pleasure of examining here on but here it is, and we can say with utmost certainty that this is the most reassuring build from Apple that we've yet seen. " "