All releases from Mac OS X 10.5 Leopard and after are UNIX 03 certified, with an exception for OS X 10.7 Lion. The first desktop version, Mac OS X 10.0, was released in March 2001, with its first update, 10.1, arriving later that year. During this time, Apple cofounder Steve Jobs had left Apple and started another company, NeXT, developing the NeXTSTEP platform that would later be acquired by Apple to form the basis of macOS. MacOS succeeded the classic Mac OS, a Mac operating system with nine releases from 1984 to 1999. Within the market of desktop and laptop computers it is the second most widely used desktop OS, after Microsoft Windows and ahead of ChromeOS. It is the primary operating system for Apple's Mac computers. Here’s how you do it.MacOS ( / ˌ m æ k oʊ ˈ ɛ s/ previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. Once you have the RAM in hand, it’s time to install. You can usually enter your model number and it will spit out the options without any fuss or nail-biting over compatibility.
The easiest way to make sure you have the right stuff is to shop at a retailer that sells RAM specifically certified for Mac use. Buy in matching pairs for maximum impact. In the case of that 2011 iMac, it requires PC3-10600 unbuffered, nonparity 1333 MHz 204-pin DDR3 SDRAM. Note that you still need to follow Apple’s requirements for technical specifics of the RAM. To find out how much RAM your iMac will really support, a site like EveryMac that tracks this data is worth checking out. The model I most recently upgraded is a 2011 vintage 27-inch iMac and although Apple lists it as supporting a maximum of 16GB of RAM, in fact it will recognize and utilize 32GB. That could be great news if your iMac is currently equipped with the maximum amount of RAM and you’re hitting a performance ceiling. Apple publishes guidelines for the maximum amount of RAM each iMac model supports, however the company is known for being conservative and memory upgrade specialists have discovered many iMacs are actually capable of supporting twice the amount of RAM Apple suggests.
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